\(\rm tan^{-1}x+cot^{-1}x=\dfrac{\pi}{2}\) holds, when – McqOptions

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1.	\(\rm tan^{-1}x+cot^{-1}x=\dfrac{\pi}{2}\) holds, when
A.	x ∈ R
B.	x ∈ R - (-1, 1) only
C.	x ∈ R - {0} only
D.	x ∈ R - [-1, 1] only
Answer» B. x ∈ R - (-1, 1) only

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