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OpenStudy (anonymous):
math help(precalc)...
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OpenStudy (anonymous):
zepdrix (zepdrix):
\[\Large\rm \cos2x=\cos x\]So where you stuck at? :) Do you remember your Cosine Double Angle Formula?
zepdrix (zepdrix):
\[\Large\rm \cos2x=2\cos^2x-1\]
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