AI in heaven

When a \ne 0, there are two solutions to (ax^2 + bx + c = 0) and they are

    \[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\]

\begin{align<em>} x^2 + y^2 &= 1 \ y &= \sqrt{1 - x^2} \end{align</em>}

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