Prove the following: `4tan^(-1)1/5-tan^(-1)1/(70)+tan^(-1)1/(99)=pi/4` `2t a n^(-1)1/5+s e c^(-1)(5sqrt(2))/7+2tan^(-1)1/8=pi/4`

Prove the following: 4tan^(-1)(1)/(5)-tan^(-1)(1)/(70)+tan^(-1)(1)/(99)=(pi)/(4)2tan^(-1)(1)/(5)+sec^(-1)(5sqrt(2))/(7)+2tan^(-1)(1)/(8)=(pi)/(4)

Prove the following: 2\ tan^(-1)3/4-tan^(-1)(17)/(31)=tan^(-1)pi/4

Prove the following: tan^(-1)1/7+2\ tan^(-1)1/3=pi/4

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

tan^(-1)5-tan^(-1)3+tan^(-1) ((7)/(9))=(pi)/(4)

Prove the following : sin^(-1)4/5+2\ tan^(-1)1/3=pi/2

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