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asinh> <acosh
[edit] Last updated: Fri, 11 Oct 2013

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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

arg

The argument to process

Return Values

The arc sine of arg in radians

See Also



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