$dy=xdx$
$\int\left(\frac{x^3-2x-1}{x^2}\right)dx$
$\int_0^2\frac{3}{x^4}dx$
$\frac{x^4-4x^2+16x-128}{x+4}$
$\int\left(\log_a\left(5x\right)\right)dx$
$6x^2+31x+30=0$
$x^2-\frac{x}{5}+\frac{1}{50}$
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