\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r8005 = b;
double r8006 = atan2(r8005, r8005);
double r8007 = sqrt(r8006);
double r8008 = a;
double r8009 = r8005 - r8008;
double r8010 = pow(r8007, r8009);
double r8011 = sin(r8010);
return r8011;
}