$84ab^4c^3+60a^4bc^2$

$\frac{dy}{dx}\left(x^x\right)\sqrt[7]{\left(x^7+6\right)\left(x-6\right)^7}$

$\frac{8x^3+5^3}{2x+5}$

$\frac{1}{1}+\left(\frac{1}{\sqrt[3]{x^2}}\right)$

$\lim_{x\to\infty}\left(\frac{x}{3}\right)^x$

$\left(1-\frac{x^2}{c^2}\right)^{\left(-\frac{1}{2}\right)}$

$\frac{dy}{dx}\left(xe^y-12x+9y=0\right)$