precalculus
posted by Ama .
Verify the identity.
csc t − sin t/csc t= cos2 t

You are missing a parenthesis !!!
I assume that you mean:
(csc t  sin t)/csc t
(1/sin t  sin t) /(1/sin t)
(1  sin^2 t) / 1
cos^2 t
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