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If sum(r=1)^(infty) tan ^(-1)((1)/(2 r^(...

If `sum_(r=1)^(infty) tan ^(-1)((1)/(2 r^(2)))=t` then `tan t` is equal to

A

`(2)/(3)`

B

1

C

`(sqrt(5))/(3)`

D

none of these

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The correct Answer is:
B
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HIMALAYA PUBLICATION-INVERSE TRIGONOMETRIC FUNCTIONS-QUESTION BANK
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