$\frac{dy}{dx}\left(\frac{\left(xsinx\right)}{lnx}\right)$

$7\left(-12x-3\right)+\left(6x+7\right)$

$\:\frac{\left(-3\right)^n}{n}\left(x-2\right)^n$

$\lim_{x\to0}\left(\frac{tan2x}{x^3}-\frac{2}{x^2}\right)$

$-6y-9x-1-3x-y$

$\int\:2x^6\:sen5x\:dx$

$\int\frac{9}{\sqrt{x^2-4}}dx$