$\frac{dy}{dx}+\frac{3y}{x}=\frac{2}{x^2}\:,\:y\left(1\right)=2$

$\lim_{x\to\frac{5}{2}}\left(5-2x\right)\tan\left(\frac{\pi x}{5}\right)$

$\left(7x^{12}+13\right)^2$

$3n-1>8$

$2\left(w+3\right)\:+\:3\left(k-2\right)$

$\left(3xy-2ab\right)\left(3xy+2ab\right)$

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