$\left(x^2y^3z+2xy^2\right)^3$
$-3x^2-\:3x^2-3x^2$
$\sqrt{4}+\sqrt{1}$
$f\left(x\right)=x-x^2$
$\frac{x}{-5}+4=-3$
$\frac{x^2\:+\:x\:-\:20}{a+1}$
$\sqrt{3}\sec x+2=2\sqrt{3}+2$
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