FRESNEL_C _ _ _ _ _ _ _ _ _ _ _ _ operator
The Fresnel_C operator represents Fresnel's Cosine function.
int(cos(t^2*pi/2),t,0,x); fresnel_c(x) on rounded; fresnel_c(2.1); 0.581564135061
The operator Fresnel_C has a limited numeric evaluation o f large values of its argument.