Range of \( f(x)=\sin ^{-1} x+\tan ^{-1} x+\sec ^{-1} x \) is....
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Range of \( f(x)=\sin ^{-1} x+\tan ^{-1} x+\sec ^{-1} x \) is
\( \mathrm{P} \)
(A) \( \left(\frac{\pi}{4}, \frac{3 \pi}{4}\right) \)
(B) \( \left[\frac{\pi}{4}, \frac{3 \pi}{4}\right] \)
(C) \( \left\{\frac{\pi}{4}, \frac{3 \pi}{4}\right\} \)
(D) \( \left(\frac{\pi}{4}, \frac{3 \pi}{4}\right] \)
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