If \( -\inftyx \leq 0 \), then \( \cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right) \) equals (A) \...

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If \( -\inftyx \leq 0 \), then \( \cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right) \) equals
(A) \( 2 \tan ^{-1} x \)
(B) \( -2 \tan ^{-1} x \)
(C) \( \pi-2 \tan ^{-1} x \)
(D) \( \pi+2 \tan ^{-1} x \)
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