Negative Argument Formulas

Rarely Tested
$$\sin^{-1}(-x) = -\sin^{-1} x, \quad x \in [-1,1]$$
$$\cos^{-1}(-x) = \pi - \cos^{-1} x, \quad x \in [-1,1]$$
$$\tan^{-1}(-x) = -\tan^{-1} x, \quad x \in \mathbb{R}$$
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