$\lim_{x\to0.2}\left(\frac{1-\cos\left(x\right)}{x}\right)$
$\frac{\left(senx+cosx\right)}{sen2x}$
$\:x^2+y^2-10x=0$
$5+ab+6+3ab-ab-2$
$t^2-18t+81$
$284+-726$
$n^2-11n+121$
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