1-tan^2A÷cot^2A-1=tan^2A
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Step-by-step explanation:
LHS = 1- 1\cot^2A÷cot^2A-1
=(cot^2A-1)/cot^2A÷cot^2A-1
= 1\cot^2A
= tan^2A = RHS
(hence proved)
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