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The complex numbers z1 and z2 and the or...

The complex numbers `z_1` and `z_2` and the origin form an isosceles trangle with vertical angle `[2pi]/3`, then a. `z_1^2+z_2^2=z_1z_2` b. `z_1^2+z_2^2+z_1z_2=0` c. `z_1^2+z_2^2=3z_1z_2` d. none of these

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