$-2\cdot4-18\cdot2-40$
$\int\:\frac{1}{8}\:cos\:\frac{x}{4}\:dx$
$\int\frac{-1}{x^3+1}dx$
$-5x<5$
$\frac{d}{dx}\frac{x^3-1}{x^2+3x+4}$
$\left(2^2\cdot2\right)\left(2^3\cdot2^2\right)^3$
$\lim_{x\to0}-\frac{4200\left(5x-1\right)}{x^2+8x+25}$
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