If (tan^(-1)x)^(2)+(cot^(-1)x)^(2)=(5pi^...

If `(tan^(-1)x)^(2)+(cot^(-1)x)^(2)=(5pi^(2))/(8)`, then x is equal to a)0 b)2 c)1 d)-1

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The correct Answer is:

`x=-1`

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