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- /*
- Taken from here;
- https://stackoverflow.com/questions/42537957/fast-accurate-atan-arctan-approximation-algorithm
- */
- #define A 0.0776509570923569
- #define B -0.287434475393028
- #define C (M_PI_4 - A - B)
- double FastArcTan(double x) {
- double xx = x * x;
- return ((A*xx + B)*xx + C)*x;
- }
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