Wednesday, August 14, 2013

verify the identity cos (x + pi/2) = -sin x

cos+%28x+%2B+pi%2F2%29=cos%28x%29cos%28pi%2F2%29-sin%28x%29sin%28pi%2F2%29 

then we can write 

cos%28x%29%2A0-sin%28x%29%2A1=-sin%28x%29

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