If \( 0x1 \), then \( \tan ^{-1} \frac{\sqrt{1-x^{2}}}{1+x} \) is not equal to (a) \( \frac{1}{2...

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If \( 0x1 \), then \( \tan ^{-1} \frac{\sqrt{1-x^{2}}}{1+x} \) is not equal to
(a) \( \frac{1}{2} \cos ^{-1} x \)
(b) \( \cos ^{-1} \sqrt{\frac{1+x}{2}} \)
(c) \( \sin ^{-1} \sqrt{\frac{1-x}{2}} \)
(d) \( \frac{1}{2} \tan ^{-1} \sqrt{\frac{1+x}{1-x}} \)
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