i have this equation

$\displaystyle f = \frac{1-exp(-2s(1-x)}{1-exp(-2s)}*\frac{1}{x(1-x)}$

when computing high values of $\displaystyle s$ i have problems as the exponential tends to very small numbers. Instead i want to take natural logs of this equation so i can avoid computing the exponentials

how do i take logs such that the exponentials disappear