$\sqrt{6\cdot6}$
$81-49x^2$
$\cos2x+\cos y-1=0$
$40x^2+60x=40$
$\left(-12\right)\:+\:\left(-13\right)\:-\:\left(-21\right)$
$x-y-y'=0$
$\frac{x^2}{2}+xseny$
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