October 2005
Intermediate to advanced
372 pages
11h 35m
English
atan()
float asin ( float num )The atan() function calculates the arc tangent value of the number provided as its only parameter, essentially reversing the operation of tan(). The return value is in radians—you should use the rad2deg() to convert radians to degrees.
$atan1 = atan(0.4346);
$atan2 = atan(tan(80));