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tan^(-1)(1/2)+tan^(-1)(1/4)=..... (A)...

`tan^(-1)(1/2)+tan^(-1)(1/4)=.....`
(A) `tan^(-1)(3/2)`
(B) `tan^(-1)(6/7)`
(C) `tan^(-1)(5/6)`
(D) `tan^(-1)(1/2)`

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tan^(-1)3-tan^(-1)2=tan^(-1)(1/7)

tan^(-1)3-tan^(-1)2=tan^(-1)(1/7)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)1+tan^(-1)2+tan^(-1)3=

tan^(-1) (1/5) + tan^(-1) (1/7) + tan^(-1) (1/3) + tan^(-1) (1/8) = π/4

tan^(-1)7-tan^(-1)5=tan^(-1)(1/18)

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