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- Function:
*double***gsl_cheb_eval***(const gsl_cheb_series **`cs`, double`x`) This function evaluates the Chebyshev series

`cs`at a given point`x`.

- Function:
*int***gsl_cheb_eval_err***(const gsl_cheb_series **`cs`, const double`x`, double *`result`, double *`abserr`) This function computes the Chebyshev series

`cs`at a given point`x`, estimating both the series`result`and its absolute error`abserr`. The error estimate is made from the first neglected term in the series.

- Function:
*double***gsl_cheb_eval_n***(const gsl_cheb_series **`cs`, size_t`order`, double`x`) This function evaluates the Chebyshev series

`cs`at a given point`x`, to (at most) the given order`order`.

- Function:
*int***gsl_cheb_eval_n_err***(const gsl_cheb_series **`cs`, const size_t`order`, const double`x`, double *`result`, double *`abserr`) This function evaluates a Chebyshev series

`cs`at a given point`x`, estimating both the series`result`and its absolute error`abserr`, to (at most) the given order`order`. The error estimate is made from the first neglected term in the series.