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- Function:
*int***gsl_sf_sin_err_e***(double*`x`, double`dx`, gsl_sf_result *`result`) This routine computes the sine of an angle

`x`with an associated absolute error`dx`,*\sin(x \pm dx)*. Note that this function is provided in the error-handling form only since its purpose is to compute the propagated error.

- Function:
*int***gsl_sf_cos_err_e***(double*`x`, double`dx`, gsl_sf_result *`result`) This routine computes the cosine of an angle

`x`with an associated absolute error`dx`,*\cos(x \pm dx)*. Note that this function is provided in the error-handling form only since its purpose is to compute the propagated error.