$x^6+4^4$

$\frac{1}{1-\log_x\left(yz\right)}+\frac{1}{1-\log_y\left(xz\right)}+\frac{1}{1-\log_z\left(xy\right)}$

$\frac{5\ln\left(x+2\right)}{x^2}$

$\left(a+2b^4\right)\left(a^2-2ab^4+4b^8\right)$

$2.53\cdot21$

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

$\left(n+7\right)x^n$