asin

(PHP 4, PHP 5, PHP 7)

asin ¡ª Arc sine

Description

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

• sin() - Sine

• asinh() - Inverse hyperbolic sine

• acos() - Arc cosine

• atan() - Arc tangent

¡û acosh

asinh ¡ú

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https://secure.php.net/manual/en/function.asin.php