$2y^2-2y^3-4y^2+4y^3$
$\lim_{x\to0}\left(\frac{1}{\log\left(1-x\right)}-\frac{1}{arctan\left(2x\right)}\right)$
$\left(3\sqrt{a}-\left(4x^2\right)\right)\left(4x^2+3\sqrt{a}\right)$
$-6v-1+v$
$\frac{3x-2}{x^3-1}$
$\frac{2^n+1}{3n^{2+1}}\cdot\:\left(x-1\right)^n$
$2a^3+4$
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