acosh
(PHP 4 >= 4.1.0)
acosh -- Inverse hyperbolic cosine
Description
float acosh ( float arg)
Returns the inverse hyperbolic cosine of arg, i.e. the value
whose hyperbolic cosine is arg.
Note: This function is not implemented on Windows platforms.
See also: acos(), asinh(), and atanh().
asin
(PHP 3, PHP 4 )
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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