$\int\left(\frac{3x^4+9x^2-1}{x^3+3x}\right)dx$
$f\left(x\right)=2\sqrt{x\:}+4e^x$
$\frac{x^2+2x+4}{-4x^2-20x-16}$
$\lim_{x\to0}\left(\frac{1-x}{x}\right)$
$\frac{d}{dx}-4x^7$
$\lim_{x\to0}\left(\frac{2e^{3x}-2}{x}\right)$
$\frac{x^4-9x^2-x+2}{x^2+9}$
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