Thursday, August 1, 2013

Find the exact value by using a half-angle identity. cos(-pi/8)

cosine is an even function so 
cos%28-pi%2F8%29=cos%28pi%2F8%29 

cos%28%28pi%2F4%29%2F2%29=sqrt%28%281%2Bcos%28pi%2F4%29%29%2F2%29 

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