Principal Square Root

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The principal square root of a number is the non-negative square root of that number. In mathematical terms, if x is a non-negative number, the principal square root of x is denoted as √x. For example, the principal square root of 9 is 3, because 3*3 = 9. The principal square root is the positive square root, as opposed to the negative square root which is denoted as -√x.

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