$\left(\frac{7}{2}t+\frac{5}{4}\right)\left(\frac{7}{2}t-\frac{5}{4}\right)$

$\left(+20\right)x\left(+2\right)$

$\int\frac{9}{x^2\sqrt{x^2-11}}dx$

$\int\frac{x+4}{x^{3}-16x}dx$

$\int-\left(x+\pi\right)\cdot\cos\left(nx\right)dx$

$27y^6-8$

$\frac{dy}{dx}\left(x^2+y^2=r^2\right)$