$\left(3x^4+3x^3-2x^2\right)^2$
$x^2-13x+x$
$\int3.6\left(90+2x\right)dx$
$\frac{d}{dx}x^44+4x^3y+y^4=20$
$\lim_{x\to\infty}\left(1+4x^{-6}\right)^{x^6}$
$\frac{e^{-x}}{4-e^{-2x}}$
$\lim_{x\to9}\left(\frac{x^3-17x^2+72x}{x-9}\right)$
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