How can I find the exact value of using the sum and difference identity? I'm guessing I'd have to split the fraction up, into 2 parts, but I'm not sure on how to proceed. Help appreciated.
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Another way . . .
you can also use the identity cos^2(x/2) = (1+cosx)/2 by taking (pie)/12 = [pie/6]/2
Originally Posted by waqarhaider you can also use the identity cos^2(x/2) = (1+cosx)/2 by taking (pie)/12 = [pie/6]/2 this is pi ... this is pie ... ... hungry?
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