Asked by Carol
verify the following identity
cos(x+y) + cos(x-y)=2cosxcosy
cos(x+y) + cos(x-y)=2cosxcosy
Answers
Answered by
MathMate
cos(a+b)=cos(a)cos(b)-sin(a)sin(b)
cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
What happens when you add the two together?
cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
What happens when you add the two together?
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