It does if you aren't using whole angles
Did you realy need to say that when I had posted
The lookup doesnt provide a result with any lack of precision. (But I know what you mean, which is why I did say for whole angles in my post)
But No, even if you are using half angles the pressision is the same, if you make the Array twice as big. You are obviously correct that if you want Cos(12.304432343), then the result will not be correct. But it would not be correct to exactly the same level of precision
I dissagree about it being pointless, It take hardly any time at all to do, and it does when all said and done work faster. There are obviosly reasons not to do it, as you have said, if the range of angles you want is continuos rather than descrete. But to dismiss it out of hand is wrong.
The most Important thing is Do cos and sin give different results on different comp. Because then we should use lookups. (I dont use lookups ATM, but thats only because Im too lazy to setup a decent include file)