Cauchy-Schwarz inequality

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This is inequality

LaTeX: 
|x^T y| \le \|x\| \|y\|,

where LaTeX: \|*\| is the Euclidean norm. (Note: for LaTeX: \|x\| = \|y\| = 1, LaTeX: x^T y is the cosine of the angle between vectors LaTeX: x and LaTeX: y.) .


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