tan^2A-cot^2A=sec^2A(1-cot^2A)
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RHS
Sec² A ( 1 - Cot² A )
= Sec² A - Sec² A Cot² A
= Sec² A - Cosec² A
= 1 + Tan² A - 1 + Cot² A
= Tan² A - Cot² A
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