$x^2-24x+80$

$2-\left(-2\right)^3$

$\int_{\sqrt{x}}^{x^4}tan\:t\:dt$

$-10-9-\left[-14+1-\left(-16+1\right)-3\right]-1$

$-6\left(0\right)^{-0^2}$

$\left(x^2-5x\right)-\left(-x^2+6\right)$

$\lim_{x\to\pi}\left(\frac{\pi^2+\sin\left(\pi\right)-\pi^2}{\cos\left(\frac{\pi}{2}\right)}\right)$