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display: \left( \sum_{k=1}^n a_k b_k \right)^{\!\!2} etc.

$$ \left( \sum_{k=1}^n a_k b_k \right)^{\!\!2} \le \left( \sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right) $$

www.math.union.edu/~dpvc/jsMath / planetmath.org

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