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PROBLEM:
If \displaystyle y= \tan\left(x+\pi \right), find x as a function of y.
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SOLUTION:
\begin{align*} y & = \tan\left(x+\pi \right) \\ x+\pi & = \tan^{-1}y \\ x & = \tan^{-1}y-\pi \ \qquad \ \color{DarkOrange} \left( \text{Answer} \right)\\ \end{align*}
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