" Evaluate "tan^(-1)((1)/(7))+tan^(-1)((1)/(13))

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

prove that tan^(-1)((1)/(7))+tan^(-1)((1)/(13))=tan^(-1)((2)/(9))

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

Evaluate: 4(2tan^(-1)(1/3)+tan^(-1)(1/7))

Prove that tan^(-1)((1)/(5)) +tan^(-1)((1)/(7)) +tan^(-1)((1)/(3)) +tan^(-1)((1)/(8)) = (pi)/(4) .

Evaluate: tan^(-1)(1)+tan^(-1)(0),

Prove that: tan^(-1) ""(1)/(7) + tan^(-1) ""(1)/(13) - tan^(-1) ""(2)/(9) =0

Prove that: tan^(-1)((1)/(5))+tan^(-1)((1)/(7))+tan^(-1)((1)/(3))+tan^(-1)((1)/(8))=(pi)/(4)

(tan^(-1)((1)/(3))+tan^(-1)((1)/(7))+tan^(-1)((1)/(13))+......+tan^(-1)((1)/(381)))=(m)/(n) where m,n in N, then find least value of (m+n)

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