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[" 23.Prove that "(tan^(2)A)/(tan^(2)A-1...

[" 23.Prove that "(tan^(2)A)/(tan^(2)A-1)-(csc^(2)A)/(sec^(2)A-csc^(2)A)=(1)/(1-2cos^(2)A)],[" 4.The first term of an AP is "3" ,the last term is "0" ."]

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