\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 r103987 = a;
double r103988 = b;
double r103989 = r103987 + r103988;
double r103990 = c;
double r103991 = r103989 + r103990;
double r103992 = 2.0;
double r103993 = r103991 / r103992;
double r103994 = r103993 - r103987;
double r103995 = r103993 * r103994;
double r103996 = r103993 - r103988;
double r103997 = r103995 * r103996;
double r103998 = r103993 - r103990;
double r103999 = r103997 * r103998;
double r104000 = sqrt(r103999);
return r104000;
}