\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r8021 = b;
double r8022 = atan2(r8021, r8021);
double r8023 = sqrt(r8022);
double r8024 = a;
double r8025 = r8021 - r8024;
double r8026 = pow(r8023, r8025);
double r8027 = sin(r8026);
return r8027;
}