$\left(3x+2a\right)^5$

$\lim_{x\to5}\left(\frac{12x-60}{x^2-6x+5.5}\right)$

$75r^2-120r+48$

$\int\left(1+\frac{1}{x}\right)\cot\left(x+\ln\left(x\right)\right)dx$

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

$x^2+x^2\cos\left(x\right)$

$\frac{2x^5-3x^3+x-4}{3x^4-x^2-3}$