===== Cos (Function) =====

==== Format ====

**cos** ( [[numericexpressions|numeric_expression]] )

returns [[floatexpressions|float_expression]]

==== Description ====

Computes the cosine of an angle expressed in radians.

==== Note ====

The cos function does not produce an exact result.

==== Example ====

<code>
clg
color black
# draw a line across the graphic output
line 0,150,300,150
# where do we start
lastx = 0
lasty = cos(0) * 50 + 150
# now step across the line and draw
for x = 0 to 300 step 5
   angle = x / 300 * 2 * pi
   y = cos(angle) * 50 + 150
   line lastx, lasty, x, y
   lastx = x
   lasty = y
next x
</code>
Draws\\
{{cos.jpg|Cosine Curve}}

==== See Also ====
{{page>en:start#Mathematics&noheader}}