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import math math.asin(arg) asin(PHP 4, PHP 5) asin — Arc sine Description
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. Parameters
Return ValuesThe arc sine of arg in radians |
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