$\int\frac{x-2}{x^2+1}dx$
$\left(2x^3+1\right)\left(x^2+2\right)^3$
$\left(4x+4\right)^2.\left(x+4\right)$
$\frac{1}{\left(x-\sqrt{\left(1-x^2\right)}\right)}$
$\left(6x^3+8y^4\right)^2$
$4x^2+12x+3$
$\frac{1}{3}\cdot21$
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