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P(7)=cc^(2)tan^(-1)(2)+cosec^(2)cot^(-1)...

P(7)=cc^(2)tan^(-1)(2)+cosec^(2)cot^(-1)(s)=19

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sec^(2)(tan^(-1)(2))+cosec^(2)(cot^(-1)(2))=

sec^(2)(tan^(-1)2) +"cosec"^(2)(cot^(-1)3)=

sec^(2)(tan^(-1)2) +"cosec"^(2)(cot^(-1)3)=

sec^(2)(tan^(-1)2) + "cosec"^(2)(cot^(-1)3)=

sec^(2)(Tan^(-1)2)+cosec^(2)(Cot^(-1)3)=

sec^(2)(tan^(-1)4)+cosec^(2)(cot^(-1)3) =

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

Sec^(2)(Tan^(-1)(2))+Cosec^(2)(Cot^(-1)(2))=

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

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