PHP 7.0.0 RC 8 Released


(PHP 4, PHP 5)

asinArc sine


float asin ( float $arg )

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



The argument to process

Return Values

The arc sine of arg in radians

See Also

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