$x\frac{dy}{dx}=y+2xy$
$\int_1^{\sqrt{x}}\left(18t^5\right)dt$
$12x^2+30x$
$4n^2+4n+1$
$\csc^2\left(x\right)+\csc\left(x\right)=2$
$\lim_{x\to0}\left(\frac{3x^2-3x+9}{x}\right)$
$20a\left(5\right)$
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