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" Prove that: "cot^(4)x+cot^(2)x=cosec^(...

" Prove that: "cot^(4)x+cot^(2)x=cosec^(4)x-cosec^(2)x

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Prove that: i) cot^(2)A+cot^(4)A="cosec"^(4)A-"cosec"^(2)A ii) tan^(2)A+tan^(4)A=sec^(4)A-sec^(2)A

Prove that: i) cot^(2)A+cot^(4)A="cosec"^(4)A-"cosec"^(2)A ii) tan^(2)A+tan^(4)A=sec^(4)A-sec^(2)A

int(cot^(2)x)/((cosec^(2)x+cosec x))dx=

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