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anonymous
 5 years ago
simplify: cos(2xy)cosysin(2xy)siny
anonymous
 5 years ago
simplify: cos(2xy)cosysin(2xy)siny

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0cos (A+B)= cosAcosB  sinAsinB

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0if u plug in A = 2x y and B=y u get the same form

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0find all solutions in the interval [0,2pie) 3sin(2tpie)=3

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0sin (2tpi) = 1 2t  pi = pi/2, 5pi/2.... 2t = 3pi/2, 7pi/2 t=3pi/4,7pi/4..and so on..there might be one more solution..check for more

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0post new questions in the questions panel from now on
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