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OpenStudy (anonymous):
prove the identity: [\left( \cos2x \over \sin x \right) = \left( \cot^2x-1 \over \csc x \right)\]
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OpenStudy (anonymous):
\[\left( \cos2x \over \sin x \right) = \left( \cot^2x-1 \over \csc x \right)\]
OpenStudy (mertsj):
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