`tan^(-1)(1/9)+tan^(-1)(3/4)=?`

If: tan^(-1)(1/3) + tan^(-1)( 3/4) - tan^(-1)(x/3) =0 , then: x=

PT tan^(-1)(3/4)+tan^(-1)(1/3)=tan^(-1)(13/9)

Prove that : tan^(-1)(1/2) + tan^(-1)(1/3) = tan^(-1)(3/5) + tan^(-1)(1/4) = pi/4

Prove that tan^(-1) (1/4) + tan^(-1) (2/9) = 1/2 sin^(-1) (4/5)

tan^(-1)3 + tan^(-1)4=

If the sum of the series tan^(-1)3+tan^(-1)(9/2)+tan^(-1)(33/4)+...... to n terms = ((2n+1)pi)/(A)+B tan^(-1)(2^(n)) then (A+B) is equal to