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Name:

acos() -- returns the arcus cosine of its numeric argument

Synopsis:
x=acos(angle)

Description:
The acos is the arcus cosine-function, i.e. the inverse of the cos-function. Or, more elaborate: It Returns the angle (in radian, not degree!), which, fed to the cosine-function will produce the argument passed to the acos-function.

Example:
print acos(0.5),acos(cos(pi))
Explanation:

  This example will print 1.0472 3.14159 which are pi/3 and pi respectively.



Related: cos, asin