\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r8020 = b;
double r8021 = atan2(r8020, r8020);
double r8022 = sqrt(r8021);
double r8023 = a;
double r8024 = r8020 - r8023;
double r8025 = pow(r8022, r8024);
double r8026 = sin(r8025);
return r8026;
}