If `pgtqgt0` and `prlt-1ltqr`, then find the value of `tan^(-1)((p-q)/(1+pq))+tan^(-1)((q-r)/(1+qr))+tan^(-1)((r-p)/(1+rp))`

If p > q > 0a n dp r < -1 < q r , then find the value of tan^(-1)((p-q)/(1+p q))+tan^(-1)((q-r)/(1+q r))+tan^(-1)((r-p)/(1+r p)) .

Find the value of 4 tan^(-1).(1)/(5) - tan^(-1).(1)/(70) + tan^(-1).(1)/(99)

The value of tan^(-1)1+tan^(-1)2+tan^(-1)3 is

Find the value of 4tan^(-1)1/5-tan^(-1)1/(70)+tan^(-1)1/(99)

Evaluate tan^(-1).(1)/(2)+ tan^(-1).(1)/(3) .

Find the value of sum_(r=0)^(oo) tan^(-1) ((1)/(1 + r + r^(2)))

Find the value of sum_(r = 1)^(10) sum_(s = 1)^(10) tan^(-1) ((r)/(s))

If p = 3 , q = 2 and r = -1, find the values of (3p^(2)q+5r)/(2pq-3qr)

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

Find value of tan^-1 (3/4)+tan^-1 (3/5)-tan^-1 (8/19)