$\frac{\left(a+3\right)\left(a-3\right)}{3\left(2a+3\right)^2}$

$\frac{dy}{dx}=2e^{-\frac{x}{5}}$

$\int\frac{s^2-3s+2}{\left(x-3\right)\left(x+3\right)\left(x+5\right)}dx$

$\left(s+e\right)^3$

$\lim_{x\to\frac{\pi}{4}}\left(\frac{\left(x-\frac{\pi}{4}\right)^2}{\left(tan\:x-1\right)^2}\right)$

$\frac{\left(8x^{10}-8x^6\right)}{x^4}$

$3x^2+3x-18$