Inverse Trigonometric Function
    1.0 Introduction
    2.0 Inverse Trigonometric function
    3.0 Properties

3.10 Property 10\[\begin{gathered} (i)2{\sin ^{ - 1}}x = \left\{ \begin{gathered} {\sin ^{ - 1}}(2x\sqrt {1 - {x^2}} ;\frac{{ - 1}}{{\sqrt 2 }} \leqslant x \leqslant \frac{1}{{\sqrt 2 }} \hspace{1em} \\ \pi - {\sin ^{ - 1}}(2x\sqrt {1 - {x^2}} ;\frac{1}{{\sqrt 2 }} \leqslant x \leqslant 1 \hspace{1em} \\ - \pi - {\sin ^{ - 1}}(2x\sqrt {1 - {x^2}} ; - 1 \leqslant x \leqslant - \frac{1}{{\sqrt 2 }} \hspace{1em} \\ \end{gathered} \right\} \hspace{1em} \\ (ii)2{\cos ^{ - 1}}x = \left\{ \begin{gathered} {\cos ^{ - 1}}(2{x^2} - 1);0 \leqslant x \leqslant 1 \hspace{1em} \\ 2\pi - {\cos ^{ - 1}}(2{x^2} - 1); - 1 \leqslant x \leqslant 0 \hspace{1em} \\ \end{gathered} \right\} \hspace{1em} \\ (iii)2{\tan ^{ - 1}}x = \left\{ \begin{gathered} {\tan ^{ - 1}}\left( {\frac{{2x}}{{1 - {x^2}}}} \right); - 1 < x \leqslant 1 \hspace{1em} \\ \pi + {\tan ^{ - 1}}\left( {\frac{{2x}}{{1 - {x^2}}}} \right);x > 1 \hspace{1em} \\ - \pi + {\tan ^{ - 1}}\left( {\frac{{2x}}{{1 - {x^2}}}} \right);x < - 1 \hspace{1em} \\ \end{gathered} \right\} \hspace{1em} \\ \end{gathered} \]
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