$\lim_{x\to0}\left(2\right)x^2-4x+2$
$4x^3y-y$
$\left(3w+7\right)^2$
$52\:-\:\left(-30\right)$
$\int15x^4dx$
$5x^4-3x^2+15x^2-9$
$\int\left(9\sin^3t\right)dt$
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