Posted by garrett on Sunday, March 4, 2012 at 11:40am.
Hint:
When there is a mixture of tan, sin and cos, use identities to convert everything into sin and cos, and simplify. This usually works, especially if the right-hand side is in sin and cosine.
For your information,
tan(x)=sin(x)/cos(x)
cot(x)=cos(x)/sin(x)
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