Function d_polyeval14 

pub(crate) fn d_polyeval14(
    x: f64,
    a0: f64,
    a1: f64,
    a2: f64,
    a3: f64,
    a4: f64,
    a5: f64,
    a6: f64,
    a7: f64,
    a8: f64,
    a9: f64,
    a10: f64,
    a11: f64,
    a12: f64,
    a13: f64,
) -> f64