$\frac{d}{dx}\left(\cos\left(e^x\right)\right)$
$\left(3x^2y'\right)\left(x+3\right)$
$\frac{12x}{6}+\frac{18}{6}$
$-8x+3x^2+5x+x^2-1-2$
$\lim_{x\to0}\left(\frac{3x^{2}}{1-\cos x}\right)$
$3x^4-x^6+x^3+2x-5$
$2x^{\frac{1}{2}}+6x^{-3}$
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