(cosecA - cotA)2=1-cosA/1+cosA
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Step-by-step explanation:
RHS
1-cosA/1+cosA
=(1-cosA)²/1-cos²A
=(1-cosA)²/sin²A
={1-cosA/sinA}²
={1/sinA-cosA/sinA}²
=(cosecA-cotA)²
=LHS
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