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Описание

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.

Список параметров

arg: The argument to process

Возвращаемые значения

The arc sine of arg in radians

Смотрите также

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