Function sincos 

pub fn sincos<S: ScalarAd>(x: S) -> (S, S)

Primal sincos.

Examples

use chainrules::sincos;

let (s, c) = sincos(0.5_f64);
assert!((s - 0.5_f64.sin()).abs() < 1e-12);
assert!((c - 0.5_f64.cos()).abs() < 1e-12);