$\frac{3}{\left(x+1\right)}+\frac{5}{\left(x-2\right)}$
$y^3-4y+3$
$\left(3x\right)\left(6x+6\right)$
$\int\frac{1}{3+27x^2}dx$
$\sqrt{45x}$
$-285-\:-12$
$\frac{\left(n+1\right)}{2^n}\left(x-1\right)^n$
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