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Mathematics
Range of f(x)= sin -1 x+ tan -1 x+ sec -1 x is
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Q. Range of $f(x)=\sin ^{-1} x+\tan ^{-1} x+\sec ^{-1} x$ is
Inverse Trigonometric Functions
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
None of these
Solution:
Correct answer is (d) None of these