arccos

#arccos

##Syntax arccos (r : real) : real

##Description The arccos function is used to find the arc cosine of a value. The result is given in radians. For example, arccos (0.5) is p / 3.

##Example This program prints out the arccosine of -1 through 1 in radians.

    for i : -4 .. 4
        const arg := i / 4
        put "Arc cosine of ", arg, " is ",
            arccos (arg), " radians"
    end for

##See also the arcsin.html and arctan.html functions for calculating arcsine and arctangent.

the arccosd.html function which finds the arc cosine of a value with the result given in degrees. (2p radians are the same as 360 degrees.)

See also predefined unit mathmodule.html.