$\int_0^{\infty}\left(ze^{-\frac{z^2}{2}}\right)dx$

$3\cdot\left(-25\right)+5\left(-5-4\right)$

$64\cdot4$

$\frac{d^2}{dx^2}\left(\frac{x^2}{4}\cdot\sin\left(x-2\right)\right)$

$3\:-\:6t\:para\:t\:=\:4$

$\int\frac{1}{\left(1+e^t\right)}dt$

$\left(\frac{24y^6\left(y^4\right)}{20y^{-7}}\right)$