asin

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

asin —Arc sine

Description

Returns the arc sine ofnum in radians.asin() is the inverse function ofsin(), which means that$num == sin(asin($num)) for every value ofnum that is in the domain ofasin().

Parameters

num

The argument to process

Return Values

The arc sine ofnum in radians

See Also

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