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Question Number 143039 by bramlexs22 last updated on 09/Jun/21

$${\cos }^{-1}\left(\frac{x^2-1}{x^2+1}\right)+\frac{1}{2}{\tan }^{-1}\left(\frac{2x}{1-x^2}\right)=\frac{2\pi }{3}$$$$x=?$$

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