\sqrt{\left(\left(\frac{\left(a + b\right) + c}{2} \cdot \left(\frac{\left(a + b\right) + c}{2} - a\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - b\right)\right) \cdot \left(\frac{\left(a + b\right) + c}{2} - c\right)}double f(double a, double b, double c) {
double r98989 = a;
double r98990 = b;
double r98991 = r98989 + r98990;
double r98992 = c;
double r98993 = r98991 + r98992;
double r98994 = 2.0;
double r98995 = r98993 / r98994;
double r98996 = r98995 - r98989;
double r98997 = r98995 * r98996;
double r98998 = r98995 - r98990;
double r98999 = r98997 * r98998;
double r99000 = r98995 - r98992;
double r99001 = r98999 * r99000;
double r99002 = sqrt(r99001);
return r99002;
}