$4.\:\frac{1}{2}^3-9.2$
$12x^2-9x=0$
$\cos\left(x+4\right)$
$18\cdot25$
$\lim_{x\to\infty}\left(4^{-x}\right)$
$9x^2+30x+9$
$53w+13<56w+16$
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