$$= 8 \cdot \frac { x } { x - ( x ) - \frac { x } { x } + \frac { 1 } { x } + \sin ^ { 2 } + x }$$
$\frac{8x^{2}}{-x\left(\cos(x)\right)^{2}+1}$
$\frac{8x\left(x^{2}\sin(2x)+x\left(\cos(x)\right)^{2}-2\right)}{-x^{2}\left(\cos(x)\right)^{4}+2x\left(\cos(x)\right)^{2}-1}$
