Question

xy+yz+zx=?[a^x=b^y=c^z abc=1]​

Answer 1

Let a=K^1/x,b=K^1/y,c=K^1/z

a*b*c=1

K^1/x*K^1/y*K^1/z=1

K^xy+yz+xz/xyz=1

xy+yz+zx=0