$-7:-1+2:-2-8.-4$

$\int\left(x^3+7\right)^7\left(x^2\right)dx$

$\left(-25\right)\cdot\left(25\right)$

$\frac{d}{dx}e^{2xy}=3y$

$12m^2n^3\:+\:8\:m^4\:n^2\:-\:4mn$

$\lim_{x\to\frac{x}{2}}\left(\frac{18}{3-e\sec\left(x\right)}\right)$

$\frac{d}{dx}\left(50\ln\left(2x\right)\right)$