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If (tan ^(-1) x)^(2)+(cot ^(-1) x)^(2)=(...

If `(tan ^(-1) x)^(2)+(cot ^(-1) x)^(2)=(5 pi^(2))/(8),` then `x=`

A

-1

B

-3

C

0

D

`(1)/(sqrt(3))`

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The correct Answer is:
A
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