(cosec-cot)2=1-cos/1+cos
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(cosec -cot)^2=1-cos/1+cos
Lhs=(1/sin-cos/sin)^2
=(1-cos/sin) ^2
=(1-cos) ^2/sin^2
=(1-cos) (1+cos) /1-cos^2
=(1-cos) (1+cos) /(1+cos) (1+cos)
=(1-cos) /(1+cos)
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