$$F(x) \frac{ \sqrt{ 1-x } }{ { x }^{ 2 } -4 }$$
$\frac{\sqrt{1-x}Fx}{x^{2}-4}$
$\frac{F\left(x^{3}-2x^{2}+12x-8\right)}{2\sqrt{1-x}\left(x^{2}-4\right)^{2}}$
