Prove that `2(tan^(-1)1/4+tan^(-1)2/9)=tan^(-1)4/3`.

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

Prove that tan^(-1). 1/2 +tan^(-1). 2/11 = tan^(-1) . 3/4

Prove that 2tan^(-1) . 1/5 +tan^(-1). 1/4 = tan^(-1) . 32/43

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

Pove that i) tan^(-1)1/2+tan^(-1)2/11=tan^(-1)3/4 ii) tan^(-1)2/11+tan^(-1)7/24=tan^(-1)1/2 iii) tan^(-1)1+tan^(-1)1/2+tan^(-1)1/3=pi/2 iv) 2tan^(-1)1/3+tan^(-1)/17=pi/4 v) tan^(-1)2-tan^(-1)1=tan^(-1)1/3 vi) tan^(-1)+tan^(-1)2+tan^(-1)3=pi vii) tan^(-1)1/2+tan^(-1)1/5+tan^(-1)1/8=pi/4 viii) tan^(-1)1/4+tan^(-1)2/9=1/2tan^(-1)4/3

tan^(-1)(1)/(4)+tan^(-1)(2)/(9)=tan^(-1)(1)/(2)

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

Prove that 2 tan^(-1) . 1/7 +tan^(-1) . 1/3 = tan^(-1) . 9/13

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

Prove that tan^(-1)3/4+tan^(-1)3/5-tan^(-1)8/19=pi/4 .