If x < 0, then write the value of cos-1 1-x21+x2 in terms of tan-1 x

If x < 0, then write the value of $\cos^{- 1} (\frac{1 - x^{2}}{1 + x^{2}})$ in terms of $\tan^{- 1} x$

Matching exercise

Match the items on the right to the items on the left.

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