$\lim_{x\to0}\left(\frac{\left(e^x-sinx-1\right)}{x^4+7x^3+10x^2}\right)$
$10+27d+7-d$
$\left(x^2-x\right).\left(x+3\right)+3x$
$60x^2y-48xy^2+72x^3y$
$a+ab$
$\left(\frac{2x}{3}+4\right)^2$
$25n^2-20n+4$
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