asin

asin

(PHP 3, 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.

See also: asinh(), acos(), and atan().

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