$\left(2x^2-3y-5z\right)^2$

$-x^4+x^2-2x^2+1$

$\lim_{x\to4}3x^3-192$

$1-\frac{x}{3}$

$\frac{sec\left(x\right)+2sin\left(x\right)}{1+tan\left(x\right)}+\frac{1-tan\left(x\right)}{sec\left(x\right)}$

$\int\frac{ln\left(t\right)}{t^4}dt$

$\:\frac{\left(n\left(x+2\right)^n\right)}{\left(3^{n+1}\right)}$