asin
(PHP 4, PHP 5)
asin — Arc sine
Description
float asin
( float
$arg
)
Returns the arc sine of arg in radians.
asin() is the complementary function of
sin(), which means that
a==sin(asin(a)) for every value of a that is within
asin()'s range.
Parameters
-
arg -
The argument to process
Return Values
The arc sine of arg in radians
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Коментарии
Hello!
Please put this example below the asin() function's description.
Thank you!
Example:
<?php
$arg = 0.5;
$val = asin($arg);
echo "asin(" . $arg . ") = " . $val . " radians.<br/>";
echo "Pi value = " . pi() . "<br/>";
echo "asin(" . $arg . ") = " . $val/pi()*180 . " degrees<br/>";
$arg = 1;
$val = asin($arg);
echo "asin(" . $arg . ") = " . $val . " radians.<br/>";
echo "Pi value = " . pi() . "<br/>";
echo "asin(" . $arg . ") = " . $val/pi()*180 . " degrees<br/>";
?>