$6ax^2-5^3\:+2a^2x\:+x^3$
$\left(4a^0\right)^4$
$81m^4\:+54m\:+9$
$x^2-30x+196$
$y\cdot\frac{dy}{dx}=\left(\frac{x^2\cdot e^x}{e^{y\cdot2}}\right)$
$\lim_{x\to-1}\left(\frac{6x^2-6}{x^2+2x+1}\right)$
$\lim_{x\to9}\left(\frac{x^2-18x+81}{x-9}\right)$
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