Coding a bullet to follow a sine wave.

[BloodRedDragon]

I'm trying to get a bullet to follow a sine wave. Currently it follows the shape of a ball bouncing. I've tried using the sin object but I'm terrible at using it and don't know how to put it into a code. I can get sin to do a curve, but that's it.
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angle = angle + 5;
directional_velocity=5;
y=y+10;