$\int x.e^{-4}dx$

$\left(x+14\right)\left(x+45\right)$

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

$x^2+y+3=2x$

$2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2$

$\frac{dy}{dx}=-\frac{x}{1+x^2}\cdot\frac{siny}{cosy}$

$\left(x^2+1\right)\frac{dy}{dx}\left(xy\right)$