$\sqrt[5+\left(-23\right)]{-9}$
$\sqrt{4e^2}4$
$\frac{1+m^8}{1+m}$
$xy'+y+1=0$
$-\frac{168}{7}$
$1+\tan^2\left(a\right)=\frac{1}{\cos^2\left(a\right)}$
$3x+10\:5x+8$
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