SOLUTION: Please prove this identity: sin[(pi/2 - x) + y] = cos(x-y)

SOLUTION: Please prove this identity: sin[(pi/2 - x) + y] = cos(x-y)

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Question 1011267: Please prove this identity:
sin[(pi/2 - x) + y] = cos(x-y)
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

start with left side and arrive to right side:

since

we have

=
= ...since and , we have

=

=...since , we have

=
=
=

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