Question
$\int_{}^{} {\frac{{\sin 3x}}{{\sin x}}\;dx = } $
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$\left[\begin{array}{cc}-1 & 5 \\ -3 & 2\end{array}\right]$
$\tan ^{-1}\left(\frac{1}{\sqrt{x^{2}-1}}\right),|x|>1$