theorem :: DIFF_3:49

for k, x0, x1, x2 being Real
for f being Function of REAL,REAL st ( for x being Real holds f . x = k / (x ^2) ) & x0 <> 0 & x1 <> 0 & x2 <> 0 & x0,x1,x2 are_mutually_distinct holds
[!f,x0,x1,x2!] = (k / ((x0 * x1) * x2)) * (((1 / x0) + (1 / x1)) + (1 / x2))