$9x-1>0$

$\frac{x^4}{\left(x^5+4\right)^2}$

$\lim_{x\to0}\cot\left(2x\right).\sin\left(6x\right)$

$\frac{8w^3h^4}{4wh^2}$

$\int\frac{5x-2}{x^2+9x+20}dx$

$\frac{dy}{dx}\left(e^y\cos\left(x\right)=1+\sin\left(xy\right)\right)$

$\left(2t^2-t+3\right)\:\left(2t^2-1\right)$