PHP asin()Functions
Examples
Returns the arcsine of different numbers:
<?php
echo(asin(0.64) . "<br>");
echo(asin(-0.4) . "<br>");
echo(asin(0) . "<br>");
echo(asin(-1) . "<br>");
echo(asin(1) . "<br>");
echo(asin(2));
?>
echo(asin(0.64) . "<br>");
echo(asin(-0.4) . "<br>");
echo(asin(0) . "<br>");
echo(asin(-1) . "<br>");
echo(asin(1) . "<br>");
echo(asin(2));
?>
Run example »
Definition and Usage
The asin() function returns the arcsine of a number.
Tip:asin(1) returns the value of Pi/2.
Syntax
asin(number);
| Parameter | Description |
|---|---|
| number | Required. Specifies a number in the range -1 to 1. |
Technical Details
| Return value: | numberThe arcsine of. Ifnumbernot in the range -1 to 1, returns NAN. |
|---|---|
| Return type: | Float |
| PHP Version: | 4+ |
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