$\frac{3x^3+2x^2-2x-1}{x+1}$

$7\tan^2\left(x\right)+3\sec^2\left(x\right)=2$

$\left(y^2-2xy+6x\right)dx+\left(-x^2+2xy-2\right)dy=0$

$\frac{dy}{dx}=\frac{2x}{y}+\frac{3y}{2x}$

$\lim_{x\to\infty}\left(\frac{1}{\sqrt{1+\sqrt{\frac{1}{\sqrt{x}}}}}\right)$

$\left(3x-7\right)\left(6x-\:8\right)$

$-6x+12=30$