Sum and Difference Formulas

Welcome to the "Sum and Difference Formulas" category on Questions LLC! If you are looking to expand your knowledge and understanding of trigonometric functions and their sum and difference formulas, you have come to the right place. This category is dedicated to helping you master these formulas and solve various types of problems involving them. Whether you are a student studying math or simply curious about trigonometry, we have a wide range of questions and answers to satisfy your curiosity and enhance your understanding. So, dive in and explore the world of sum and difference formulas with Questions LLC!

Questions (7)

Find cos(a+b). sin a = 3/5, a lies in Quadrant I, and cos b = 12/13, b lies in Quadrant I.
1. 3 answers
2. asked by JO
3. 1,222 views
prove sin(x+y)+sin(x-y)/cos(x+y)+cos(x-y)=tanx
1. 4 answers
2. asked by liv
3. 2,803 views
Show that sin(x+pi)=-sinx.So far, I used the sum formula for sin which is sin(a+b)=sin a cos b+cos a sin b. sin(x+pi)=sin x cos
1. 5 answers
2. asked by girly girl
3. 1,298 views
given that sin(a+b)= 56/65, cos(a+b)-33/65, cos(b)=-12/13 and pi/2<b,pi/Find: sin(a)? cos(a)? tan(a)?
1. 2 answers
2. asked by jared
3. 462 views
Prove that sin(A+B+C+)cos(B+C)-cos(A+B+C)sin(B+C)=sinA
1. 1 answer
2. asked by Mike
3. 321 views
If cos(a)=1/2 and sin(b)=2/3, find sin(a+b), if1) Both angles are acute; Answer: (sqrt(15)+2)/6 ii) a is an acute angle and pi/2
1. 2 answers
2. asked by Brandi
3. 486 views
Prove thatcos(A+B)+cos(A+B)=2cosAcosB
1. 1 answer
2. asked anonymously
3. 15 views