If tan40° = $α$, then find $\frac{tan320°-tan310°}{1+tan320°.tan310°}$.

$\frac{1-α^2}{α}$ $\frac{1+α^2}{2α}$ $\frac{1-α^2}{2α}$ $\frac{1+α^2}{α}$

$\frac{1-α^2}{2α}$