$\frac{d}{dx}\sqrt{4x-3}$
$x^6-8y^12$
$4r^2-12r+7$
$x^2+4x+5=0$
$\frac{sen^2x}{\cos x}.secx$
$\lim_{x\to\infty}\left(\frac{4x^2-2x+1}{\sqrt{3x^4-3x^3+1}}\right)$
$7-9\le5$
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