$\int\frac{\left(x^2\right)}{\sqrt{9x^2+1}}dx$
$-155-32$
$\int\frac{x^3-6x+1}{x^4+6x^2+8}dx$
$-7-83+42+31-9-3$
$\left(a+1\right)\left(a-1\right)\left(a-3\right)\left(a+3\right)$
$\frac{dy}{dx}=\frac{xy-2x-y+2}{xy-3x+3y-9}$
$\frac{5}{4}a^2b-a^2b$
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