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sec^(2)(tan^(-1)2)+cos ec^(2)(cot^(-1)3)...

sec^(2)(tan^(-1)2)+cos ec^(2)(cot^(-1)3)=15

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prove that sec^(2)(tan^(-1)2)+cosec^2(cot^(-1)3)=15

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Prove that: sec^(2) (tan^(-1)2) + "cosec"^(2)(cot^(-1)3)=15 .