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anonymous
 5 years ago
evaluate cos 220 cos40+sin220sin40
anonymous
 5 years ago
evaluate cos 220 cos40+sin220sin40

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0This question came up earlier, I think spanishkb31 is in your class...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0okay, cos(40) = cos(40) and cos(a+b) = cos(a)cos(b)  sin(a)sin(b)...

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0well, if you replace cos(40) with cos(40), you get: cos 220 cos(40)  sin220sin(40) which is the sum of angles formula for cosine cos(a+b) = cosa cosb  sina sinb so, what is (a+b) ?
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