sqrt()
Returns the square root of the specified number. If a negative number is passed to the parameter, this returns NaN
(Not a Number). It returns null when it receives an argument value that is not a number.
Syntax
sqrt(NUM_EXPR)
Required Parameter
NUM_EXPR
- Expression that returns int, short, long, float, or double
Usage
sqrt(4) => 2
sqrt(-1) => NaN