$\lim_{x\to0}\left(13sin\left(7x\right)ln\left(7x\right)\right)$

$37+5\left(x\right)\left(3z\right)$

$-9\:-\:\left(-14\right)-\left(-20\right)$

$\sqrt[3]{\left(3x^2yz\right)}\cdot\sqrt[3]{\left(2x^2y^2z\right)}$

$\sqrt[3]{6x^2-x^3}-x$

$\lim_{x\to0}\left(\frac{e^x-x-1}{1-cosx}\right)$

$\frac{6x^3+7x^2-11x-1}{3x+5}$