atan

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

    atan — Arc tangent

    Description

    atan(float$num): float

    Returns the arc tangent of num in radians. atan() is the inverse function of tan(), which means that $num == tan(atan($num)) for every value of num that is in the domain of atan().

    Parameters

    num

    The argument to process

    Return Values

    The arc tangent of num in radians.

    See Also

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