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Consider the complex number z=1-i . Choose from below, the correct response/s....

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Consider the complex number z=1-i. Choose from below, the correct response/s.

In polar form $z^2=2\,\text{cis}\left(\dfrac{\pi}{2}\right)$ z^2=2\,\text{cis}\left(\dfrac{\pi}{2}\right).

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In polar form $z^3=2\sqrt{2}\,\text{cis}\left(-\dfrac{3\pi}{4}\right)$ z^3=2\sqrt{2}\,\text{cis}\left(-\dfrac{3\pi}{4}\right).

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In Cartesian form z^4 = -4

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In Cartesian form z^4 = 4

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