$2x^2-15x+28$
$\frac{10x}{x^2+7+6}$
$\frac{dy}{dx}=-\frac{2xy}{-x^2-y^2}$
$\int4x^{3}\sqrt{x^{2}+1}dx$
$\int_0^4\left(\frac{t}{t^2-9}\right)dt$
$\left(x^3+4x-3\right)\left(x^2+2\right)$
$80-40+200-1000$
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