The sum of `cot^(-1)(3/4)+cot^(-1)(7/4)+cot^(-1)(19/4)+ cot^(-1)(39/4)......oo`

The sum of cot^(-1)((7)/(4))+cot^(-1)((19)/(4))+cot^(-1)((39)/(4))+cot^(-1)((67)/(4))..... oo is equal to :

Prove that cot^(-1)(3)-cot^(-1)(4)=cot^(-1)(13)

Find the sum to n terms cot^(-1)(3)+cot^(-1)(7)+cot^(-1)(13)+cot^(-1)21

The sum of the infinite series cot^(-1)((7)/(4))+cot^(-1)((19)/(4))+cot^(-1)((39)/(4))....oo

The value of cot^(-1)(cot(7pi)/(4)) is:

tan^(-1)(cot4x)

Find- cot^(-1)1+cot^(-1)2+cot^(-1)3

2cot^(-1)5+cot^(-1)7+2cot^(-1)8=(pi)/(4)