(cosecA-sinA)(secA-cosA)(tanA+cotA)=?
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(1/sinA-sinA)(1/cosA-cosA)(sinA/cosA+cosA/sinA)
(1-sin^2A/sinA)(1-cos^2A/cosA )(sin^2A+cos^2A/sinAcosA)
cos^2A/sinA×sin^2A/cosA×1/sinAcosA
=1
here is ur answer
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