$121x^2-4$

$\frac{z\:cos\:\left(\sqrt[3]{z^2+3}\right)}{\left(\sqrt[3]{z^2+3}\right)^2}$

$\left(y^3\sqrt{x^2y}\right)\left(z^3\sqrt{y^2}z\right)\left(x^3\sqrt{xz^2}\right)$

$\frac{72}{-8+4}$

$\left(203-\left[-55\right]\right)-\left(-82+\left[-104\right]\right)-\left[-248+\left[-56\right]\right]$

$7\left(3x-2\right)=28$

$\int\frac{e^{4x}}{e^{2x}+1}dx$