Let \( f(x)=2 \tan ^{-1} x=\left\{\begin{array}{ll}\cos ^{-1}\left(... VIDEO
Let \( f(x)=2 \tan ^{-1} x=\left\{\begin{array}{ll}\cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right), & x \geq 0 \\ -\cos ^{-1}\left(\frac{1-x^{2}}{1+x^{2}}\right), & x0\end{array}\right. \)https://bit.ly/YTAI_PWAP https://www.pw.live
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