`cosec2A + cot2A = cotA`

` (sin 2A )/(1-cos 2A) = cot A.`

Cosec 2A + Cosec 4A + Cosec 8A = Cot A - Cot 8A

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`cosec2A-cot2A=`

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`cot^2A([secA-1]/[1+sinA])+sec^2A([sinA-1]/[1+secA])=0`