\sin \left({\left(\sqrt{\tan^{-1}_* \frac{b}{b}}\right)}^{\left(b - a\right)}\right)double f(double a, double b) {
double r7983 = b;
double r7984 = atan2(r7983, r7983);
double r7985 = sqrt(r7984);
double r7986 = a;
double r7987 = r7983 - r7986;
double r7988 = pow(r7985, r7987);
double r7989 = sin(r7988);
return r7989;
}