On Thu, 18 Mar 1999, Graham Daniel wrote:

> r=(x^2+y^2)^.5
>
> use a table to store x & y values for 0 to 90 degrees in your minimum
> step size. if accuracy is important and table size is small then you
> must interpolate values inbetween table entries.

PTM: You don't need y -table at all. Use x table backwards:
sin(x)=cos(90-x) in first quadrant.

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