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tan^(-1) x +cot^(-1)x =(pi)/(2) holds, w...

`tan^(-1) x +cot^(-1)x =(pi)/(2)` holds, when

A

`x in R`

B

`x in R -(-1, 1)` only

C

`x in R-{0}` only

D

`x in R [-1, 1)` only

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A
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