$\lim_{x\to\infty}\left(\frac{x^4}{e^{4x}}\right)$
$\frac{\left(2x^3-7x^2-3x+2\right)}{x-4}$
$6x^2+43x+40$
$\frac{10x^5}{2x}$
$f\left(x\right)=\:\sqrt{\frac{5}{x}}-\sqrt{\frac{4}{x}}$
$\left(\frac{2}{3}x\:+4\right)^2$
$\frac{dy}{dx}=\frac{-x}{y+1}$
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