$\lim_{x\to0}\left(-\frac{sin^3x}{1-cosx}\right)$
$36x^2-12x+1$
$7x+10y-3z+8x-2y+6z$
$-389-468$
$11^2+5\cdot\left(8-3\right)^2-7^5+7^3$
$12r^2+36rs+27s^2$
$\frac{d}{dx}\left(\frac{x-1}{x^2+5x+10}\right)$
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