$-\left(3-9\left(1-3+\left(8+2-1\right)-\left(2-5\right)-13\right)+4-3\right)$

$x^2+8x+20=0$

$\lim_{x\to\infty}\left(1+\frac{2}{x}\right)^{4x}$

$\int_{\frac{-\pi}{2}}^{\frac{3\pi}{2}}\left(\sqrt{25-25\cos^2\left(x\right)}\right)dx$

$\lim_{x\to0}\left(\sqrt{x^2+4x}\right)$

$\left(ax\right)^3\cdot\left(ax\right)^2\cdot ax$

$6z^2+-9z+-9$