Cosine
float Cosine(void);
rmatrix.xx = (FT_Fixed)( rotationAngle.Cosine() * 0x10000);
rmatrix.yy = (FT_Fixed)( rotationAngle.Cosine() * 0x10000);
smatrix.xy = (FT_Fixed)(-shearAngle.Cosine() * 0x10000);