
John M. answered 05/06/14
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Jeff, I think you have an error in your transcription
Take a look at this link
http://www.numberempire.com/graphingcalculator.php?functions=%281%2Bsin%282*x%29%29%2F%281-sin%282*x%29%29%2C%28cot%282*x%29^2%29&xmin=-3&xmax=3&ymin=-3&ymax=3&var=x
I've graphed the left hand side (cot^2(2A)) in yellow and the right hand side in blue.
If you have an identity, their graphs have to be identical.