Posted by lindsay on Tuesday, April 24, 2012 at 6:47am.
The equation you gave is NOT an identity,
Did you mean
sin (2Ø)/(1 - cos^2 Ø) = 2cotØ ?
LS = 2sinØcosØ/(sin^2 Ø)
= 2cosØ/sinØ
= 2cotØ
= RS
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