$-16\cdot\left(0\right)-3$

$\left(\frac{1}{\sin\left(x\right)}+\frac{1}{\tan\left(x\right)}\right)\cdot\left(\frac{1}{\sin\left(x\right)}+\frac{1}{\tan\left(x\right)}\right)$

$-4\left(4-2+5\right)-1-\left|8+\left(-3-1\right)-\left(-7-4\right)\right|$

$\frac{x}{3x^2}$

$\int\frac{\left(x^2+1\right)}{\left(x^3-9x\right)}dx$

$\frac{dy}{dx}=3x^2\:+6$

$4n^2-32n=-4n^2-14$