$17\:+\:20\:x\:3$

$\left(\frac{3x}{y}\:-\frac{y}{3x}\right)^4$

$\lim\:_{x\to\:0}\left(\frac{sin\left(x^2+2x\right)}{3x^2+x}\right)$

$\frac{3x^3+6x^2+3x-1}{x+1}$

$\frac{csc\left(x\right)}{\cos\left(x\right)}+\frac{sec\left(x\right)}{sin\left(x\right)}=2$

$\int e^{7x}\sec\left(e^{7x}\right)\tan\left(e^{7x}\right)dx$

$\frac{dy}{dx}=\frac{3x^2+x-3}{3y^4}$