$-\frac{y}{x^2}dx+\frac{1}{x}dy=0$
$\left(2x+5y^3\right)^2$
$\int x\left(x^4-6x^2-2x+4\right)dx$
$\int\frac{\left(x^2+1\right)}{x-2}dx$
$18x^2-39x+20$
$-5r-7x-r+7x$
$\int\left(\frac{1}{3+\sqrt{x+2}}\right)dx$
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