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Let z1, z2 in C such that z1^2 + Z2^2...

Let `z_1, z_2 in C` such that `z_1^2 + Z_2^2 in R`. If `z_1(z_1^2-3z_2^2) = 10 and z_2(3z_1^2-z_2^2 )=30 `Find the value of `(z_1^2 +z_2^2)`.

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