$u=x+y^3-3$
$-4x^2+19x-21=-7x^2+34x-33$
$\frac{2x^3+x^2-x+3}{2x+3}$
$\int_{-1}^2w^2e^{4w}dw$
$x\frac{dy}{dx}=tany$
$\frac{3}{4}+\frac{3}{12}$
$500-285$
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