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OpenStudy (anonymous):
verify identity sinxsecxtanxcscx = sinx/1-sin2x
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OpenStudy (gorv):
\[\sin x * \frac{ 1 }{ cosx }*\frac{ sinx }{cosx }*\frac{ 1 }{ sinx }=\frac{ sinx }{ \cos^{2}x }\]
OpenStudy (gorv):
cos2x=1-sin2x
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