$\lim_{x\to0}\left(\cos\left(\frac{3.14159265359}{2}-x\right)\right)^x$

$49g^2+56gn+16n^2$

$1\:6\:a\:4\:si\:5\:c+2\:4\:a\:4\:si\:3\:c\:2\:+3\:6\:a\:4\:si\:2$

$\frac{dy}{dx}=\frac{\left(13-y^2\right)}{4}$

$\frac{r}{14}>-3$

$10+\left(-7\right)+3-\left(-5\right)$

$\left(\sqrt{xy}-\sqrt{x}\right)dx+\left(\sqrt{xy}+\sqrt{y}\right)dy$