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sqrt() function in PHP
The sqrt() function Returns the square root of a number.
Syntax
sqrt(num)
Parameters
num − The number for which you want to find the square root
Return
The sqrt() function Returns the square root of the specified number.
Example
<?php echo(sqrt(16)); ?>
Output
4
Example
Let us see another example −
<?php echo(sqrt(0.25) . "<br>"); ?>
Output
0.5<br>
Example
Let us see another example −
<?php echo(sqrt(-144)); ?>
Output
NAN
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