## Cos

### Function Type:

The cos function operates on REAL or COMPLEX arguments only.

### Function Purpose:

The cos function takes a REAL or COMPLEX argument ( an angle in radians ) and
returns the value of cosine for that argument.

### Required Arguments:

cos (x)

Where x is a REAL or COMPLEX argument that contains a value for an angle in **radian
**form.

### Optional Arguments:

There are no optional arguments.

### Results:

To use this function, just do something similar to the following:

x = 60

pi = 3.1415926

x = x/180*pi ( remember, the angle must be in radians )

x = cos(x)

Naturally in this example the value of x will be 0.5. Please note that the variable that the
function returns its value to does not have to be the same argument that was passed to it.

### For more examples and information see:

lecture seven, and twenty nine

examples fall2.f, trapeziod.f

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Written by Jason Wehr : jcw142@psu.edu and Maintained by John Mahaffy :
jhm@cac.psu.edu