$x\frac{dy}{dx}+2y=2x^3$
$x^2y+x\left(x+2\right)y=e^x$
$\frac{9x^3-2x+1}{x^2-4x+2}$
$4n-6=250$
$\int u\sec\left(u\right)du$
$-5x<-35$
$-\csc^22x$
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