$\int\frac{9x^2-5}{x^3-x^2+x-1}dx$
$\left(a+3b\right).3=3a+9b$
$\int x\sqrt{9+\left(x+2\right)^2}dx$
$4p-7q+5p-12p-11q+8p-11q+12r+p+5r$
$x^2+30x+200$
$x\frac{dy}{dx}-y=2x^2y,\:y\left(1\right)=1$
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