$x\frac{dy}{dx}-2y=6x^2$

$\lim_{x\to\infty}\left(\frac{x}{ln\left(x\right)^2}\right)$

$\frac{1}{csca-cota}-\frac{1}{sina}$

$\lim_{x\to\infty}\left(\frac{e^x-3}{\ln\left(e^x+2\right)}\right)$

$\left(4m^2n-3\right)^3$

$\lim_{x\to-2\:}\left(\frac{5x}{4-x^2}\right)$

$2x-18+-6x-2$