$\int\frac{5}{2\left(9x^2+1\right)^2}dx$
$\lim_{x\to0}\left(\frac{x^2+4x}{3x^3+x^2-x}\right)$
$x^2+6x=72$
$\left(6x^2+1\right)^2$
$\left(-3x^2+2x-1\right)\left(x^2+3x+1\right)$
$x^4-14x^2+45$
$\frac{x^4+2x^3-10x^2-11x-7}{x-3}$
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