$\left(\sqrt{5^{-4}}\right)^{\frac{1}{2}}.\left(\frac{1}{5}\right)^{-2}$
$x^2+4x+4y-4=0$
$a^6-b^2\:x^8$
$18+2x^2+7x-3x^2$
$\sqrt{-\frac{25}{4}}$
$\left(y^3-2y\right)^2$
$\sin\left(6x\right)=0$
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