ActionScript 3.0 :: Creating An Opponent And Attack On Certain Angle Only?

Nov 22, 2011

I'm a design base student and planning to make some interactive game, but I'm still quite a novice when comes to programming...Hopefully can get some suggestion on how to programme an enemy with some artificial intelligence as shown below:
 
I'm tring to make a still enemy(char) which will throw random items(star with  "R" ) on stage....and the character I'm controlling need to dodge the random items that throw towards him. The programming process went on quite well, but I just realize I can't figure out how to throw the items randomly within the given angle (90 degrees)
 
So far I'm only alble to shoot items in 1 direction only but not in random directions (like those classic jet fighter game). I try google for the solutions but all require complex math equation which include sin, cos, tan. Which I do not understand at all. Is there a simpler solution which do not involve complex calculation, or workaround method ? 

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