Point me to a good trigonometry (sin/cos) tutorial

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Hi guys been a while since I blitz =D

I have been playing alot of old school overhead 2D shoot-em-ups recently and got the itching to make my own.

I have never been all that good at the math to make a bullet shoot in an arc or to get rocket to follow a target etc... so before I start I would like to get my head around the whole sin/cos thing.

Can any 1 recommend a good online tutorial?