Find the domain of its inverse function

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Find the domain of the inverse of the function y=(4/pi)*arctan(x). Given that |x|>1 .

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The domain of the inverse funvtion of $$y=(4/\pi)*\arctan(x)$$ is the domain of $$ y=tan(\pi x/4)$$.

with the given condition of $|x|>1$

Thus we have $$|\pi x/4 |<\pi/2$$ and $$|x|>1$$ which implies $$1<|x|<2$$