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並前往https://www.php.net/manual/en/function.sqrt.php

sqrt - Manual - PHP

sqrt. (PHP 4, PHP 5, PHP 7, PHP 8). sqrt — Square root ... pow() - Exponential expression; M_SQRTPI - sqrt(pi); M_2_SQRTPI - 2/sqrt(pi); M_SQRT2 - sqrt(2) ...

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