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2T a n^(- 1)1/3+tan^(- 1)(1/7)=...

`2T a n^(- 1)1/3+tan^(- 1)(1/7)=`

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Prove that tan^(- 1)(1/3)+tan^(- 1)(1/7)+tan^(- 1)(1/13)+..........+tan^-1 (1/(n^2+n+1))+......oo = pi/4

Prove that tan^(- 1)(1/3)+tan^(- 1)(1/7)+tan^(- 1)(1/13)+..........+tan^-1 (1/(n^2+n+1))+......oo =pi/4

Prove that tan^(- 1)(1/3)+tan^(- 1)(1/7)+tan^(- 1)(1/13)+..........+tan^-1 (1/(n^2+n+1))+......oo =pi/4

2"Tan"^(-1)1/3+"Tan"^(-1)1/7=

2"tan"^(-1)1/3+"tan"^(-1)1/7=

2Tan^(-1)(1)/(3)+tan^(-1)((1)/(7))=

Prove that 2 tan^(-1) . 1/7 +tan^(-1) . 1/3 = tan^(-1) . 9/13

tan ^(-1) (1/3)+tan ^(-1) (1/5)+tan ^(-1) (1/7)=tan ^(-1) x, then x=