$\int\frac{\ln\left(x\right)}{-3x^2}dx$

$\frac{d}{dx}\frac{x}{x+1}$

$3^2+3\left(3\right)\left(1\right)-\left(-4^2\right)$

$\frac{\frac{\cos\left(x\right)}{\sin\left(x\right)}}{\frac{1}{\sin\left(x\right)}-\frac{\sin\left(x\right)}{1}}$

$\frac{x\left(9x+11\right)}{3z+2}+1$

$x^2\left(x^2-3x+4\right)$

$\left(5z-u\right)\left(3z+4u\right)$