$\frac{dy}{dx}=3\left(y-20\right)y$

$\lim_{x\to infinite}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$

$4n^2-28n+49$

$\lim_{x\to1}\frac{ln\left(x\right)}{sin\left(2\pi\:x\right)}$

$\left(2x+y-3\right)\left(x+4a+1\right)$

$2p-4q-3p+4q-15$

$\int30cos\left(5x\right)e^{\frac{65}{3}x}dx$