Bisection-Regula falsi-Bolzano

Question

I want to ask about these theorems in Matlab, to confirm the requirement that x1, x2 where f(x1) * f(x2) < 0 is there any way to find x1, x2 if i have the function eg. $$f(x) = \tan(x)\frac{(e^{2x} - 1)}{(e^{2x} + 1)} + 1$$ by code. Thanks