$x^2-12x-121=0$
$1.1\:x\:10$
$\lim_{x\to0}\left(\frac{sinxsin5x}{x^2}\right)$
$2\left(3ab^3\right)$
$cos^2x-sin^2x=1$
$0.24\cdot0.32$
$3-2\cdot\left(2\cdot3-2\cdot4\right)$
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