prove that(cosec^2A-1)(secA+1)(secA-1) =1
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Step-by-step explanation:
(cosec^2A-1) (secA+1)(secA-1)=1
LHS=(cosec^2A-1) (secA+1) (secA-1)
=(1/sin^2A-1) (sec^2-1)
=(1-sin^2A/sin^2A) (1-cos^2A/cos^2A)
=1
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