Prove the identity.(cot ?)( cot ? - tan ?) = cos 2? csc2 ?

What will be an ideal response?

Answers may vary. One possible solution is:
(cot ?)( cot ? - tan ?) = cot2 ? - 1 =  - 1 
=  = (cos2 ? - sin2 ?) ?   = cos 2? csc2 ?.

Mathematics

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