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If secx = 8 and -pi/2 < x < 0, find the exact value of sin2x
Use the identity sin 2x = 2(sinx)(cosx) if secx = 8, then cosx = 1/8
3 answers
asked by
Ashley
1,033 views
Verify the identity:
tanx(cos2x) = sin2x - tanx Left Side = (sinx/cosx)(2cos^2 x -1) =sinx(2cos^2 x - 1)/cosx Right Side = 2sinx
1 answer
asked by
Ashley
1,111 views
If cosx = 10/19 an pi < x < 2pi, find the exact value of cos x/2
Use the double angle formula. Cos 2Y= sin^2 Y - cos^2Y =
3 answers
asked by
Ashley
645 views
Compute inverse functions to four significant digits.
cos^2x=3-5cosx rewrite it as.. cos^2x + 5cosx -3=0 now you have a
1 answer
asked by
Kate
534 views
solve to four decimals places
5.0118 sinx - 3.1105=0 :for all real x values I will be happy to critique your work. Solve for
3 answers
asked by
Kate
473 views
solve to four decimal places
1.3224sinx + 0.4732=0 :for all real x values solve for sinx, then arcsinx. solve for sinx, then
1 answer
asked by
Kate
482 views
I don't know the physics behind Snell's Law, but I can do the math
Snell's Law says sin(angle of incidence)/sin(angle of
1 answer
asked by
Reiny
638 views
sin(2 tan-1 7/24) (that is inverse tangent)
Draw a 7 24 25 right triangle. Label the angle whose tangent is 7/24. What is its
1 answer
asked by
Jeane
667 views
Height of an Obelisk Two people decide to find the height of an obelisk. They position themselves 25 feet apart in line with,
2 answers
asked by
Ashli
1,098 views
if a tire is out of round so that the radius in a certain direction is 1 inch more than in the opposite direction, what is the
2 answers
asked by
Kay
1,085 views
Use the half angle formula to find the exact value of
tan 7 pie/8
4 answers
asked by
Kay
2,908 views
Establish the identity:
1. sin0(cot0 + tan0) = sec0 2. cos0 +1/cos0 -1 = 1 + sec0/1 - sec0
1 answer
asked by
Kay
465 views
establish identity
sec 0/1 + sec0 = 1 - cos0/sin^2 0
2 answers
asked by
Kay
559 views
Solve the equation on the interval 0 less than or equal 0 < 2pi.
1. sec 30/2 = -2 2. cos(20 - pi/2) = -1 3. tan(0/2 + pi/3) = 1
3 answers
asked by
KC
1,007 views
use a graphing utility to solve each equation, rounded to 2 decimal places
1. x^2 - 2sin2x = 3x 2. x^2 = x + 3cos2x
2 answers
asked by
KC
699 views
Evaluate the trigonometric function using its period as an aid.
cos 5pi how would i go about finding the period and what is a
4 answers
asked by
Anonymous
4,661 views
does sin and tan repeat 2Pi as well? and what do csc sec an cot do? -2PI?
1 answer
asked by
Anonymous
406 views
Solve the following interval
0<_ (less than or equal to)0(Theta)<2pi: 1. sin0(theta) + sin2 0(theta) = 0 2. 2cos^20 (theta) +
2 answers
asked by
Kay
667 views
x[sqrt of 2] + 3x = 4
1 answer
asked by
Anonymous
243 views
Please EXPLAIN the steps on how to solve these problems. Please provide detailed steps.
A rectangle picture is 12 by 16 inches.
4 answers
asked by
Hellga
530 views
Find the exact value of sin2(theta) if cos(theta) = -sqrt 5/3 and 180 < theta < 270.
A)-1/9 B)-4 sqrt 5/9 C)1/9 D)4 sqrt 5/9 B?
6 answers
asked by
Jon
1,945 views
Find the exact value of sinx/2 if cosx = 2/3 and 270 < x < 360.
A)1/3 B)-1/3 C)sqrt 6/6 D)-sqrt 6/6 C, since I KNOW cosx is
5 answers
asked by
Jon
880 views
Verify that each of the following is an identity.
tan^2x-sin^2x=tan^2xsin^2x I can get it down to cos^2 on the right, but cannot
2 answers
asked by
Andrea
739 views
Can somebody please help me find the domain of:
1 / cos4x If there are any working out, could you be kind enough to show your
2 answers
asked by
sqleung
832 views
Hi. Can somebody help me solve this equaton with EXACT answers?
----- sin3x = 0 ----- Thankyou! All help is appreciated.
1 answer
asked by
sqleung
398 views
Solve ABC if C=90 degrees, B=20 degrees, and b=10. Round measures of side to the nearest tenth and measures of angles to the
2 answers
asked by
Jon
598 views
Rewrite -25 degrees in radian form.
-25 =-25(pi radians/180) =-25pi/180 radians =-5pi/36
1 answer
asked by
Jon
471 views
Rewrite 9pi/5 radians in degree measure.
9pi/5 =9pi/5(180/pi radians) =1620/5 =324 degrees
2 answers
asked by
Jon
677 views
Find one angle with positive measure and one angle with negative measure coterminal with -310
-310+360=50 -310-360=-670 so
3 answers
asked by
Jon
1,038 views
Find the exact values of the six trigonometric functions 0 if the terminal side of 0 in standard position contains the
3 answers
asked by
Jon
2,913 views
Find the exact value of cot(-pi/6).
I don't have a lot of work for this one all I have is 30 I guess that was suppose to be the
1 answer
asked by
Jon
477 views
Find the exact value of: sin405.
reference angle=225 sin225= -.707106781 = -.71
2 answers
asked by
Jon
716 views
Find the exact value of: tan(-3pi).
3 answers
asked by
Jon
1,205 views
Find the exact value of: sin60-cos60.
do I just type sin60-cos60 in my calculator? = .37
1 answer
asked by
Jon
433 views
Find the area of ABC if A=56 degrees, b=20ft, and c=12ft.
1/2(20)(12)sin56 1/2(240)sin56 99.5
1 answer
asked by
Jon
309 views
In triangle ABC, A=35 degrees, a=43, and c=20. Determine whether ABC has no solution, one solution, or two solutions. Then solve
5 answers
asked by
Jon
553 views
Should the triangle be solved beginning with Law of Sines of Law of Cosines. Then solve the triangle. Round to the nearest
2 answers
asked by
Jon
617 views
Should the triangle be solved beginning with Law of Sines of Law of Cosines. Then solve the triangle. Round to the nearest
7 answers
asked by
Jon
1,843 views
P(-15/17,-8/17) is found on the unit circle. Find sin theta and cos theta.
P(-15/17,-8/17)= P(cos theta,sin theta) sin=-8/17
2 answers
asked by
Jon
747 views
Solve: x=Arctan(-sqrt3).
1 answer
asked by
Jon
320 views
Verify that (secx/sinx)*(cotx/cscx)=cscx is an identity.
(x=theta BTW)
2 answers
asked by
Jon
548 views
Find the amplitude, if it exists, and the period of: y=tan1/4x.
no amplitude I got confused, is the period 4pi? And is that the
1 answer
asked by
does it matter at this point?
464 views
State the vertical shift and the equation of the midline for y=4cosx-1.
k = -1 y = -1 vertical shift = -1 midline equation is
1 answer
asked by
does it matter at this point?
346 views
Find secx if sinx = -4/5 and 270 < x < 360.
tan^2x+1=sec^2x (-4/5)^2+1=sec^2x 16/25+1=sec^2x 17/25=sec^2x sqrt 17/5 I don't know
2 answers
asked by
does it matter at this point?
569 views
Simplify: (1/secx+sin^2x/cosx)cosx.
Explain alittle bit, not just do the steps please.
1 answer
asked by
does it matter at this point?
408 views
Find the exact value of: cos315.
I have to use the sum angle formula cos(270+45) cos270 cos45 - sin270 sin45 thats all I have. Is
1 answer
asked by
does it matter at this point?
470 views
Solev the equation for t if 0 is less than or eual to t which is less than 2 pi
7sin + radical3 = 5 sin t
1 answer
asked by
Selma
353 views
Solve in terms of sine and cosine:
sec(x) csc(x)- sec(x) sin(x) so far I have: 1/cos(x) 1/sin(x) - 1/cos(x) sin(x) I am not sure
4 answers
asked by
Dennis
590 views
Simplify: csc A - sin A - Cot A
Cot A Csc A 1/sin - sin A - 1/tan 1/tan 1/sin -sinA?
2 answers
asked by
Courtney
758 views
What is sin^2 - cos^2 x/ 1-2cos^2 x, using the identities.
2 answers
asked by
Mary
521 views
Find sec theta if sin theta = -4/5 and 270 degrees < theta < 360 degrees.
4 answers
asked by
Justin
3,254 views
Two planes leave an airport at the same time, one flying at 300 km/h and the other at 420 km/h The angle between their flight
4 answers
asked by
Doni
798 views
Find all x and y between 0 and 2pi so that the equation is ture
-2 cosx -i sin y = 2 sinx +i i am also having trouble with this
3 answers
asked by
Ellie
425 views
Is this formula continous on the interval (-1,1)
h(theta)=(theta)sin(theta) I say no, but could some one explain the process
1 answer
asked by
George
357 views
The depth of water in a tank oscilliates sinusoidally once every 6 hours. If the smallest depth is 5.5 feet and the largest
3 answers
asked by
George
1,105 views
How do you find an equation of a line perpendicular to y=x at the point (5,5) in standard form?
3 answers
asked by
ali
454 views
Find all of the solutions between 0 and 2pi:
2sin(x)^2 = 2 + cos(x)
2 answers
asked by
Trig
893 views
I was just wondering if anyone can explain the Law of Sines- "Ambiguity Case" to me, in a way that is easy to understand.
1 answer
asked by
Ariel
369 views
cos2x(2cosx+1)=0
Solve for x.
4 answers
asked by
Ted
738 views
Find all the solutions in the interval [0,2pi).
2sin2x - sqrt(2) = 0 sin2x = sqrt(2)/2 I'm confused by the double angle. Please
6 answers
asked by
Travis
3,239 views
Please explain inverse functions. i.e.
find angle if Sin x = 2.3 divided by 8.15. Answer 16.30 degrees. How did they do that???
1 answer
asked by
John
341 views
Can someone check my answers so far?
1. Find the exact value of tan(-3ð) Answer: tan(-3ð) = tan (-3 + 2ð) = tan (-ð) = tan
3 answers
asked by
Kasey
631 views
Rules of Logarithms: Can someone explain how to do:
1) e^(2(ln)(x)) 2) e^(-lnx) I know the rules I just don't understand how they
3 answers
asked by
Alli
1,142 views
tan(to the second power) s sin(to second power)=tan(to second power + cos(second power) s - 1...I need the steps on how to get
1 answer
asked by
Courtney
922 views
given sin(4x)=5/13 in Q II
find Tan(2x) and cos(2x)
1 answer
asked by
Hayden
361 views
Sin(X-y)sin(x+y)=sin^2 x - sin^2 y
work on one side only...so i worked on the right =(sinx-siny)(sinx+siny) does that equal
3 answers
asked by
Alice
2,462 views
A straight trail with a uniform inclination of 17deg leads from a lodge to an elevation of 900 feet to a mountain lake at a
2 answers
asked by
Amber
675 views
Using a double angle formula how would you find the exact value of this expression?
Cos²105° - sin²105°
4 answers
asked by
Brian
1,273 views
solve sin(2 theta)< cos( theta)
1 answer
asked by
maggie
363 views
sin(70°)cos(10°) − cos(70°)sin(10°)
2 answers
asked by
Jesse
935 views
give the missing value:
sin 54.2=? -->i think its 0.811 but i might be wrong. sec 23.2=? --->i think its 1.08, but again, i could
2 answers
asked by
Mary
900 views
The angle 2x lies in the fourth quadrant such that cos2x=8/17.
1.Which quadrant contains angle x? 2. What is the measure of x, in
3 answers
asked by
Jus
912 views
h t t p : / / m a t h c e n t r a l . u r e g i n a . c a / Q Q / d a t a b a s e / Q Q . 0 9 . 9 9 / a n g e l a 2 . 2 . g i f
g
3 answers
asked by
Trig
758 views
Special Angles And their Measures
Fill out the Table Below: in degrees Sin Cos Tan 0 30 45 60 90 120 135 150 180 210 225 240 270
7 answers
asked by
Jennifer
1,456 views
Two observers 1 km apart spot an airplane. The angles of elevation of the airplane from the two observers are 22 degrees 50
3 answers
asked by
Trig
1,243 views
I have no idea how to do this problem
From an airplane flying 2 kilometers aboce the ocean, a piolet sees two ships directly to
5 answers
asked by
Trig
643 views
Help with solving radical fractions.
1 answer
asked by
Anonymous
294 views
Does anybody know a good website that will help me with finding the six trig functions of a point NOT on the unit cricle?
1 answer
asked by
Anonymous
435 views
A 30 degree central angle is in central position in a circle with a radius of 7 square roots of 5 (245). What are the
1 answer
asked by
Ashley
426 views
A line goes through points (2�ã3,-3) and (8�ã3,3). Find the equation of the line through these 2 points and the angle of
3 answers
asked by
Sarah
467 views
Need hellpp!!
If a bicycle has 26 inch diameter wheels and the front “chain”drive has a radius of 2.1 inches and the back
3 answers
asked by
Alli
1,684 views
Find the exact circular function value for:
sec(23pi/6) I know the answer should be: [2sqrt(3)]/3, but I do not understand how to
7 answers
asked by
Lauren
4,821 views
The state highway commission has decided to build a bridge over a dangerous railroad crossing. The approach ramp has to be
2 answers
asked by
Anonymous
501 views
Your school is getting a 10,000 seat stadium to hold spectators for your home football and baseball games. For each row of
1 answer
asked by
Anonymous
434 views
Verify the Identity
(sin m +sin n)/ (cos m + cos n) = tan(m + n/2)
4 answers
asked by
Steve
1,091 views
I need help with these kind of problems!
Can someone tell me how to work this problem out? Given tan0=2 square root of 5 over 4,
1 answer
asked by
Jennifer
433 views
Determine the quadrant in which each lies:
sec0<0,cot0<0 sin0<0,tan0>0
2 answers
asked by
Jennifer
1,019 views
Linear and angular speed
Find w for each of the following: 1. the minute hand of a clock 2. the second hand of a clock The answer
2 answers
asked by
Laken
548 views
A billboard rests on top of a base. From a point level with the bottom of the base, the angle of elevation of the bottom of the
3 answers
asked by
Alexis
503 views
How come cosine of 225 degrees is a positive number i thought it was negative because it's reference angle would be 45 degrees
7 answers
asked by
Trig
607 views
Find the area of the triangle.
b=125 c=162 <B=40 (b and c are the sides) (<B is the angle)
3 answers
asked by
Jennifer
923 views
I need help with these kind of problems. We are dealing with word problems and/or pictures that are solved by the Law of Sin or
6 answers
asked by
Jennifer
458 views
If sin^2X=A what is an algebraic expression in A for cos(2X). I have no idea where to even begin with this!
1 answer
asked by
Gina
305 views
How do you do this problem?
1+i(square root of 3)
1 answer
asked by
Kevin
311 views
Find the distance from pi.
7 pi/6. I subtracted 2 pi from this and got -5pi/6. But the correct answer is pi/6. Whwere did this
4 answers
asked by
Victoria
414 views
Why is the arctan of - square root of 3 equal a negative value (-pi/3) While the Arccos of -1/2 equal a positive value (2 pi/3)?
2 answers
asked by
Trisha
807 views
There is a right triangle with a left side of six, a bottom side of 10, and a hypoteneuse 11.66. How do you find the other two
3 answers
asked by
Sam
383 views
How do I find all solutions in the interval [0, 2Pi):
cotx=cscx-1 the answer choices are: a.) x=Pi/2 b.) x=Pi/2 and 3Pi/2
2 answers
asked by
Grace
540 views
Are any of these three problems identities?
1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If
2 answers
asked by
Melody
983 views
Are any of these three problems identities?
1. Cos^2x-sin^2x=1-2sin^2x 2. Sinxsecx=cosxcscx 3. Sec^4x-tan^4/sec^2x=1+sin^2x If
3 answers
asked by
Melody
697 views
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