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tan^(2)A+cot^(2)A=sec^(2)A csc^(2)A-2...

tan^(2)A+cot^(2)A=sec^(2)A csc^(2)A-2

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(b) prove that tan^(2)A+cot^(2)A+2=sec^(2)A*cosec^(2)A

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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

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