Intervals for bisection method

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I have this function below: $$f(x) = \tan(x)\frac{(e^{2x} - 1)}{(e^{2x} + 1)} + 1$$ and I want to find the intervals to use the bisection method. The first interval I think is $f(0) = 1 >0$ but i can't find the $f()<0$. Does anybody have an idea about that?