I once did that as well: https://github.com/Const-me/AvxMath/blob/master/AvxMath/AvxMathTrig.cpp https://github.com/Const-me/AvxMath/blob/master/AvxMath/AvxM...

I once did that as well: https://github.com/Const-me/AvxMath/blob/master/AvxMath/AvxMathTrig.cpp https://github.com/Const-me/AvxMath/blob/master/AvxMath/AvxM... The method is different, and the OP hasn’t mentioned it — high-degree minimax polynomial approximation.