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cos ( numeric_expression )

returns float_expression

Computes the cosine of an angle expressed in radians.

The cos function does not produce an exact result.

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

Draws