\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r8004 = b;
double r8005 = atan2(r8004, r8004);
double r8006 = sqrt(r8005);
double r8007 = a;
double r8008 = r8004 - r8007;
double r8009 = pow(r8006, r8008);
double r8010 = sin(r8009);
return r8010;
}