$y = \exponential{\tan{-2 x}}{-1} $
Solve for x
x=-\frac{\tan(y)}{2},\nexists n_{1}\in \mathrm{Z}\text{ : }y=\pi n_{1}+\frac{\pi }{2}\text{ and }|y|\leq \frac{\pi }{2}
Solve for y
y=-\arctan(2x)
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