\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r8019 = b;
double r8020 = atan2(r8019, r8019);
double r8021 = sqrt(r8020);
double r8022 = a;
double r8023 = r8019 - r8022;
double r8024 = pow(r8021, r8023);
double r8025 = sin(r8024);
return r8025;
}