$\frac{\left(-x^3\right)^2}{\left(-x\right)}$

$\left(2x^3+3x\right)\left(x^2+3\right)$

$\frac{\left(-9+5\right)\cdot\left(-3\right)}{-3-3}$

$\lim_{x\to\infty}\left(1-e^{\frac{1}{2}-\frac{1}{x}}\right)$

$\frac{dy}{dx}=\frac{y\:-\:x}{y\:+x}$

$2\left(x+5x\right)=96$

$\left(3a^2+4\right)\left(9a^4-12a^2+16\right)$