$\frac{d}{dx}x^3-4x^2+4x$
$\sin\left(-6u\right)$
$\lim_{x\to\infty\:}\left(\frac{12-81^{\frac{489}{x}}}{4}\right)^x$
$\lim_{x\to1}\left(\frac{x}{2x-2}\right)$
$( 4 + x ) y ^ { 2 } = y ^ { 3 }$
$\left(x^2-3\right)\left(-3-x^2\right)$
$a^4+2a^2+24$
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