$\left(4x^2\:+\:2x\right)\:-\:\left(2x^2\right)$
$-2-\left(1+\left(-4\right)\right)$
$\cos\left(x^2+5x\right)$
$3x+5x^4$
$\frac{d}{dx}\frac{e^x}{5x+4}$
$a+3\cdot a-1$
$\:\:n\:2\:+\:n\:-\:20\:=\:$
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