$6+log2b=\:9$
$\sqrt{5x^4}$
$\frac{dy}{dx}=\frac{y-x+1}{y-x+5}$
$\lim_{x\to0}\left(\frac{2x-sen\left(x\right)}{x}\right)$
$3x\ge6$
$\frac{dy}{dx}=2\cdot\:\:x\cdot\:\:cos\left(7\cdot\:\:y\right)$
$2mn\left(\frac{3x}{7}-1\right)$
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