$40^2$
$18ft\cdot12in$
$\frac{9}{5}x+2<5x+3$
$y'-y=y^2e^x$
$\lim_{x\to0}\left(\frac{sinx\:-1}{cos^2x}\right)$
$5\cdot\left(x-6\right)=20$
$\lim_{x\to0}\left(\frac{\sqrt{x^2+4}-3cosx+1}{1-cosx}\right)$
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