If \( a \leq \tan ^{-1} x+\cot ^{-1} x+\sin ^{-1} x \leq b \). Then
(a) \( a=0, b=\pi \)
(b) \( ...
If \( a \leq \tan ^{-1} x+\cot ^{-1} x+\sin ^{-1} x \leq b \). Then
(a) \( a=0, b=\pi \)
(b) \( b=\frac{\pi}{2} \)
(c) \( a=\frac{\pi}{4} \)
(d) None of these
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