cos
| Definition: | atom x2 = cos(atom x1) |
| Description: | Return the cosine of x1, where x1 is in radians. |
| Comments: | This function may be applied to an atom or sq_cos() to all elements of a sequence.
The rules for sequence operations apply.
Note that the following diagram uses degrees, ie cos(30*CD_DEG2RAD) = 0.866, where CD_DEG2RAD is defined in pGUI as PI/180. 
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| Example: |
x = cos(.5) -- x is 0.8775826 |
| Implementation: | via :%opCos in builtins\VM\pTrig.e (an autoinclude) |
| See Also: | sin, tan, log, sqrt |