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Let z1, z2........ zn be equi-modular no...

Let `z_1, z_2........ z_n` be equi-modular non-zero complex numbers such that `z_1+z_2+z_3+...+z_n=0` Then `Re(sum_(j=1)^n sum_(k=1)^n(z_j/z_k))`

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