\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r8006 = b;
double r8007 = atan2(r8006, r8006);
double r8008 = sqrt(r8007);
double r8009 = a;
double r8010 = r8006 - r8009;
double r8011 = pow(r8008, r8010);
double r8012 = sin(r8011);
return r8012;
}