$\frac{6z^3+42z^2}{2z^2+26z+84}$

$\frac{\left(3a^{-4}\right)}{\left(b^7\right)}3$

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

$\lim_{x\to2}\left(\frac{x^3-x^2-x+10}{x^2+3x+2}\right)$

$\left(6a^3+2b^5\right)^3$

$v+1.17=4.71$

$\frac{tgx+\frac{1}{cosx}.cscx}{tgx+\frac{1}{cosx}.cscx}$