Hướng dẫn dùng arc sine trong PHP

(PHP 4, PHP 5, PHP 7, PHP 8)

asin — Arc sine

Description

asin(float $num): float

Returns the arc sine of num in radians. asin() is the inverse function of sin(), which means that a==sin(asin(a)) for every value of a that is within asin()'s range.

Parameters

The argument to process

Return Values

The arc sine of num in radians

See Also

• sin() - Sine
• asinh() - Inverse hyperbolic sine
• acos() - Arc cosine
• atan() - Arc tangent

rahmatjon at gmail dot com ¶

1 year ago

Hello!
Please put this example below the asin() function's description.
Thank you!

Example:
    $arg = 0.5;
    $val = asin($arg);
    echo "asin(" . $arg . ") = " . $val . " radians.
";
    echo "Pi value = " . pi() . "
";  
    echo "asin(" . $arg . ") = " . $val/pi()*180 . " degrees
";$arg = 1;
    $val = asin($arg);
    echo "asin(" . $arg . ") = " . $val . " radians.
";
    echo "Pi value = " . pi() . "
";  
    echo "asin(" . $arg . ") = " . $val/pi()*180 . " degrees
";
?>