Fix broken angle calculation with negative epsilon numbers #49
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When calculating
Cos(-epsilon)orSin(-epsilon), the result is incorrect.The behavior is due to
WrapAngle(-epsilon)returns exactly360degrees,and
int iQuadrant = int(360.0/90.0); // iQuadrant == 4, which is actually a quadrant with index0. So this operation must be wrapped around to produce stable results. Otherwise, index4is reading past the end of corresponding array.