$\lim_{x\to\frac{\pi}{2}}\left(\frac{\sin\left(\frac{3\pi}{2}-x\right)+\left(x-\frac{\pi}{2}\right)}{-\sec\left(x-\frac{\pi}{2}\right)}\right)$

$12+x=-2$

$100x^8-1$

$\int\frac{1}{x^2+4x+8}dx$

$\frac{\left(\left(3^2\right)^3-3^{-4}\right)}{\left(9^{-2}\right)}$

$x^2-18x+4$

$\left(-\frac{1}{5}\right)^{-5}$