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asin() function in PHP
The asin() function returns the arc sine of a number. It specifies a number in the range -1 to 1. Returns NaN, if num is not in the range -1 to 1.
Syntax
asin(num)
Parameters
num − The number for which you want to return the arc sine. Specifies a number in range -1 to 1.
Return
The asin() function returns the arc sine of a number. It specifies a number in the range -1 to 1. Returns NaN, if num is not in the range -1 to 1.
Example
<?php echo(asin(0.50) . "<br>"); echo(asin(-0.90) . "<br>"); ?>
Output
0.5235987755983<br>-1.1197695149986<br>
Let us see another example −
Example
<?php echo(asin(0) . "<br>"); echo(asin(1) . "<br>"); echo(asin(-1) . "<br>"); echo(asin(2) . "<br>"); ?>
Output
0<br>1.5707963267949<br>-1.5707963267949<br>NAN<br>
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