$\lim_{x\to0}\left(\frac{2\left(x+h\right)-2x}{h}\right)$
$\frac{18}{3}-1$
$\int\left(2x+3\right)^99\:dx$
$2\left(1-\cos\left(x\right)^2\right)^2$
$x^2-15x-54<0$
$2x^2-8x-24\le0$
$\left(x-x^2\right)\left(x+21\right)$
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