Hướng dẫn acos php

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

acos — Arc cosine

Description

acos(float $num): float

Returns the arc cosine of num in radians. acos() is the inverse function of cos(), which means that a==cos(acos(a)) for every value of a that is within acos()' range.

Parameters

The argument to process

Return Values

The arc cosine of num in radians.

See Also

• cos() - Cosine
• acosh() - Inverse hyperbolic cosine
• asin() - Arc sine
• atan() - Arc tangent

rahmatjon at gmail dot com ¶

1 year ago

Hello!
There is no any example for acos() function. Please put this one below the acos() function's description.
Thank you!

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