check for a square root
any valid type domain
An expression is of type sqrt if it is a radical and the exponent has a denominator of 2.
An expression is of type sqrt(domain) if it is of type radext(domain) and the exponent has a denominator of 2.
Note that a square root of a product or quotient is not of type sqrt because it evaluates to a product or quotient of square roots.
When used in the second form, it is necessary to enclose sqrt in forward (unevaluation) quotes to prevent the sqrt function from being invoked.
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