Alternative Equation Formats

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MathML

A = \frac{{\bar{x}}^{2}}{\frac{1}{n} \sum_{i = 1}^{n} x_{i}^{2}}

\[ A = \frac{ \bar{x}^2 }{ \frac{1}{n} \sum _{i=1}^ n x_ i^2 } \]