asin

(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

num: The argument to process

Return Values

The arc sine of num in radians

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