__Function:__double**gsl_sf_angle_restrict_symm***(double*`theta`)__Function:__int**gsl_sf_angle_restrict_symm_e***(double **`theta`)-
These routines force the angle
`theta`to lie in the range @math{(-\pi,\pi]}.

__Function:__double**gsl_sf_angle_restrict_pos***(double*`theta`)__Function:__int**gsl_sf_angle_restrict_pos_e***(double **`theta`)-
These routines force the angle
`theta`to lie in the range @math{[0, 2\pi)}.

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