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asinh acosh

Last updated: Fri, 26 Jan 2007

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# 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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asinh acosh

Last updated: Fri, 26 Jan 2007
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