$\left(3x-6y-2z\right)^2$

$f^2+5f+4$

$-m+n+m+n$

$3-\left(-4\right)+5-\left|2-\left(4-\left(-7\right)+10\right)\right|$

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

$\left(3+i\sqrt{2}\right)^2$

$\int_{\frac{\pi}{6}}^{\frac{\pi}{2}}\left(7cot^2\left(x\right)\right)dx$