how many decimal places are enough for sin, cos

[DevilMayCry]

I am making game and I need to move MovieClips around with

x += speed * cos( angle );
y += speed * sin( angle );

Instead of calling cos() and sin() functions, which is too slow, I'll use sin and cos table.

So I wonder if anyone knows what's optimal number of decimal places for sin values. Five, seven, twelve, more...?

[Schfifty Five]

I really don't think you'll notice any speed increase by using a sin/cos table instead of using the Math.sin and Math.cos functions. If you're using one anyway though, I would think that 5 decimal places would be enough. Some games use 3.14 for pi and it's not really noticeable.

[691175002]

Ive benchmarked it in the past and lookup tables are slower than calling the actual functions.

[DevilMayCry]

My table is 1 second faster than Math.sin... per million lops.
And it has 15 decimal places.

Well maybe it's a bug in Flash CS and AS3...