asinh
(PHP 4 >= 4.1.0)
asinh -- Inverse hyperbolic sine
Description
float asinh ( float arg)
Returns the inverse hyperbolic sine of arg, i.e. the value
whose hyperbolic sine is arg.
Note: This function is not implemented on Windows platforms.
See also: asin(), acosh(), and atanh().
atan2
(PHP 3>= 3.0.5, PHP 4 )
atan2 -- Arc tangent of two variables
Description
float atan2 ( float y, float x)
This function calculates the arc tangent of the two variables
x and y. It is similar to calculating the arc tangent of
y / x, except that the signs of both arguments are used
to determine the quadrant of the result.
The function returns the result in radians, which is between
-PI and PI (inclusive).
See also acos() and atan().
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