Prove that
`tan^(-1) 2 + tan^(-1) 3 = (3pi)/4`

Sovle tan^(-1)2x+tan^(-1)3x=(pi)/4

Prove that 4 tan^(-1) . 1/5 - tan^(-1) . 1/70 + tan^(-1) . 1/99 = pi/4

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

Prove that tan^(-1). 1/2 + tan^(-1) . 1/5 + tan^(-1). 1/8 = pi/4

Prove that: tan^(-1)x+tan^(-1)(1/x)=pi/2

Show that ( tan^(-1) 1 + tan^(-1) 2 + tan^(-1) 3) = pi

Prove that: tan^(-1) \ 2/3=1/2tan^(-1) \ 12/5

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

Prove that : 2"cot"^(-1)1/3+"tan"^(-1)3/4=pi .

The sum of the infinite terms of the series cot^(-1)(1^2+3/4)+cot^(-1)(2^2+3/4)+cot^(-1)(3^2+3/4)+...+oo is equal to a. tan^(-1)(1) b. tan^(-1)\ \ (2) c. tan^(-1)2\ d. (3pi)/4-tan^(-1)3