SOLUTION: evaluate cos(2theta - pi/2) I need the most detail

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Question 1144209: evaluate cos(2theta - pi/2)
I need the most detail
Answer by AnlytcPhil(1806) About Me  (Show Source):
You can put this solution on YOUR website!
cos%282theta+-+pi%2F2%29

Use these identities:

cos%28alpha-beta%29=cos%28alpha%29cos%28beta%29%2Bsin%28alpha%29sin%28beta%29
sin%282alpha%29=2sin%28alpha%29cos%28alpha%29
cos%28pi%2F2%29=0
sin%28pi%2F2%29=1



Edwin