$\left(3n-a\right)^2$
$\lim_{x\to-3}\left(\frac{2x^2+x-15}{x+3}\right)$
$\frac{3x^3}{4x}$
$\frac{dy}{dx}=\frac{2x^3-y}{2x}$
$\sqrt[2]{4+\sqrt[3]{27}}$
$\frac{lnx}{\left(1+x\right)^2}$
$14x^2\:-\:21x^3+49x^4$
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