$\int\left(-\frac{7sinx}{8-4cosx}\right)dx$

$\lim_{x\to\infty}\left(\frac{x^2+2}{x-1}^{\frac{1}{x}}\right)$

$\left(\sqrt{\frac{x}{y}}-\sqrt{\frac{y}{x}}\right)^2$

$\int\frac{2}{sec\:2x}dx$

$\left(n+6\right)\left(n+9\right)$

$\left(1-x\right)\frac{dy}{dx}=y^2$

$100x^2y^6-z^4$