$\frac{\left(2-3x\right)}{\left(2x^{2\:}-3x+1\right)}$
$-6x-12\ge-18$
$30=10.x$
$\frac{x^2-7x-30}{x+4}$
$\lim_{x\to0}\left(\frac{1-sin\left(\frac{\pi}{2}-x\right)}{x}\right)$
$\int\frac{7x-2}{2x+3}dx$
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