$\lim_{x\to0}\left(5x^3+4x^2-x\right)$
$\lim_{x\to\infty}\left(\frac{4-4\sqrt{x}}{2+11\sqrt{x}}\right)$
$a^2+a^2-4ab$
$12\left(4+1\right)$
$\frac{6}{2-4x}$
$10+8+9\cdot4$
$\frac{dy}{dx}=\left(\frac{2x+3}{4x+5}\right)$
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