$2x^3y^2+\frac{y^4}{9}$
$sinx\left(\sqrt{3}cosx-1\right)=0$
$25x-100^4$
$\cos\left(\arctan\left(x^2+2\right)\right)$
$\left(+6\right)\::\:\left[\left(+5\right)\:-\:\left(+7\right)\right]$
$\left(x-a+c\right)\left(x+b-c\right)$
$\frac{x}{9-4x}+\frac{3x}{4x-9}$
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