prove 1/sec-1 - 1/ sec+1 = 2 cot^2a
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Step-by-step explanation:
Lhs = 1/secA-1+1/secA+1
= (secA+1+secA-1)/sec² A-1=2secA/tan²A
=2×1cosA ×cos²A/sin²A
=2cosecA.cotA
RHS
HENCE PROVED
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