1. The problem statement, all variables and given/known data Derive the following relation, where z1 and z2 are arbitrary complex numbers |z1z2*+z1*z2| ≤ 2|z1z2| 3. The attempt at a solution I found the expression |z1z2*+z1*z2| = |2(a1a2+b1b2)| = √(4[a12a22 + 2a1a2b1b2 +b12b22]) But that is where I get stuck. How does the equal sign become an inequality? Also, there are no imaginary terms in my expression, but there ARE imaginary terms in the right hand side, so I think I am doing something wrong. I also tried doing the derivation using polar forms but it got complicated very quickly. Thanks.