\left|\left(\left(\tan^{-1}_* \frac{\mathsf{expm1}\left(\sin \left(\mathsf{expm1}\left(a\right)\right)\right)}{\tan^{-1} a}\right) \bmod a\right)\right|double f(double a) {
double r8060 = a;
double r8061 = expm1(r8060);
double r8062 = sin(r8061);
double r8063 = expm1(r8062);
double r8064 = atan(r8060);
double r8065 = atan2(r8063, r8064);
double r8066 = fmod(r8065, r8060);
double r8067 = fabs(r8066);
return r8067;
}