$\left(2z-4\right)\left(2z+9\right)$
$\frac{-2+3\cdot2}{2}$
$\lim_{x\to0}\left(\frac{\left(1+x^4-cos\left(x^2\right)\right)}{x^4}\right)$
$-18.7+5.25$
$\frac{\sqrt{x+1}}{\sqrt{x}}$
$x^2-24x+144=0$
$\int_{-1}^1\left(x^2-1\right)xdx$
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