$\sqrt{7}\sqrt{7}$
$72x\:+\:18\:$
$\frac{dy}{dx}-3y=2$
$x+2x-2$
$\lim_{x\to\infty}\left(\frac{3x^2+5x^3}{2x^2-3x}\right)$
$5\cos^2b-5\sin^2b=5\cos^2b-5$
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