$\frac{x^{4}-8x+15}{x^{2}-9}$
$\frac{\left(6x^2+17x-45\right)}{2x+9}$
$x\frac{dy}{dx}+2y=x^{-3}$
$y=\left(3x^4-4x^3\right)^{-2}$
$\left(10mn+5x^2\right)^2$
$20ab+12ba-15xy+6xy-ab+2yx$
$m\frac{dy}{dx}=mg-kx^2$
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