Express as a single trig function: how can I solve this question: 2cos^2 (pie/4)-1 THanks
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Originally Posted by Ttops Express as a single trig function: how can I solve this question: 2cos^2 (pie/4)-1 double angle identity ... $\displaystyle \cos(2x) = 2\cos^2{x} - 1$ fyi ... this is pie this is pi ...
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