$-2\left(x+3\right)+3x$
$\lim_{x\to\infty}t\:\sin\left(\frac{1}{t}\right)$
$25x^2-36=0$
$\sqrt{-\left(x^2+x-1\right)}$
$\lim_{x\to0}\left(\frac{\left(cos2x-sin2x-1\right)}{\pi\:^3-x^3}\right)$
$-73+2$
$44+91-6$
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