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A.L
Questions and answers by visitors named
A.L
Questions (3)
2cos^2a*cos^2b+2sin^2asin^2b-1=cos2acos2b
1 answer
339 views
2cos^2a*cos^2b+2sin^asin^b-1=cos2acos2b how to prove it
3 answers
325 views
2cos^2a*cos^2b+2sin^2asin^2b-1=cos2acos2b how to prove it,please help me
1 answer
845 views
Answers (3)
2cos^2a*cos^2b+2sin^2asin^2b-1=cos2acos2b you are right... if you know how to prove it please help me
x-y-z=-2 z=x-y+2 2x-3y-z=-8 2x-3y-x+y-2=-8 x-2y=-6 -4x+3y+z=6 -4x+3y+x-y+2=6 -3x+2y=4 + x-2y=-6 -2x=-2 x=1 y=3,5 z=-0,5
#1 x=price of citrons y=price of fragrant 7x+10y=88 10x+7y=82 70x+100y=880 - 70x+49y=574 51y=306 y=6 x=4
