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If $\left|z^{2}-1\right|=|z|^{2}+1$, then $z$ lies on

1) the real axis
2) an ellipse
3) a circle
4) the imaginary axis.
in Mathematics by Diamond (74,866 points) | 15 views

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$\Rightarrow R(z)=0 \Rightarrow z$ lies on the imaginary axis.

by Diamond (74,866 points)

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