$r^2-16$
$\int\frac{\sqrt{2x}}{x}dx$
$-3sinx=cos2x$
$4a^2b^2-\frac{2}{3}ab^2+\frac{2}{3}a^2b+\frac{1}{2}ab^2$
$x=lny'+siny'$
$-91-50+30+20-10-5+\:2$
$5a+4b=40$
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