$\frac{a^{12}-b^{12}}{a^3+2b^3}$
$\frac { 12 n ^ { 2 } - 8 n } { 2 n }$
$y^2dx-\frac{dy}{\cos^2x}=0$
$x^2+\frac{5}{6}x$
$\lim_{x\to0}\left(\frac{3x\left(e^x-1\right).\cos\left(x\right)}{sin^2\left(x\right)}\right)$
$4\sqrt{3}\cdot\sqrt{21}$
$\int\frac{2x}{x^2+x}dx$
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