If \( 3 \tan ^{-1} x+\cot ^{-1} x=\pi \), then \( x \) equals (A) 0...

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If \( 3 \tan ^{-1} x+\cot ^{-1} x=\pi \), then \( x \) equals
(A) 0
(B) 1
(C) \( -1 \)
(D) \( \frac{1}{2} \).
P
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