SOLUTION: proove that 1/sin2A+cos4A/sin4A=cotA-cosec4A

First we work with the left side:


Get LCD




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Now we work with the right side:



There is an identity 
We can flip both sides and get



If we let  and therefore , we get



So the right side of the identity that we are to prove becomes:







Get LCD:





We have worked each side separately to the same expression.
So we have proved the identity.

Edwin