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- 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*(-\pi,\pi]*.Note that the mathematical value of

*\pi*is slightly greater than`M_PI`

, so the machine numbers`M_PI`

and`-M_PI`

are included in the range.

- 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*[0, 2\pi)*.Note that the mathematical value of

*2\pi*is slightly greater than`2*M_PI`

, so the machine number`2*M_PI`

is included in the range.