SOLUTION: Simplify the following expressions as much as possible.
cos(x+y)-cos(x-y)
Algebra.Com
Question 1138452: Simplify the following expressions as much as possible.
cos(x+y)-cos(x-y)
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Use these two identities
to say that,
The original expression simplifies to -2sin(x)sin(y)
is an identity. It is a true equation no matter what values of x and y you select.
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