Fresnel integrals C(x) and S(x) are defined as C(x) = integral(cos(pi t2/2)dt,0,x) and S(x) = integral(sin(pi t2/2)dt,0,x).
Some sources don't use multiplier before t2 (in this case, the integral is multiplied by the scaling coefficient), so you should watch closely what integral is being referred to.
FresnelIntegral subroutine calculates C(x) and S(x) using piecewise rational approximation.
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