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In a triangle ABC if sum tan^(2)A= sum t...

In a triangle ABC if `sum tan^(2)A= sum tan A tan B`, then largest angle of the triangle in radian will be :

A

`(2pi)/(3)`

B

`(pi)/(3)`

C

`(pi)/(2)`

D

`(3pi)/(4)`

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The correct Answer is:
B
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