8 cot^ A-8 cosec^ A is equal to
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=>8cosec^2A-8cot^2A=8
=8/sin^2A-8cosec^2A/sin^2A
=(8-8cos^2A)/sin^2A
=8(1-cos^2A)/sin^2A [1cos^2A=sin^2A]
=8sin^2A/sin^2A
=8.
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