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(PHP 4, PHP 5, PHP 7)

asinArc sine


asin ( float $arg ) : float

Returns the arc sine of arg 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.



The argument to process

Valorile întoarse

The arc sine of arg in radians

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