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સાબિત કરો :tan^-1(1/2 tan2 A )+tan^-1(co...

સાબિત કરો :`tan^-1(1/2 tan2 A )+tan^-1(cotA)+tan^-1(cot^3 A )=pi,0 < A < pi/4`

A

0

B

pi/2

C

pi

D

`2pi`

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