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z2/z1 = (A) e^(itheta) cos theta (B) e^(...

`z_2/z_1 =` (A) `e^(itheta) cos theta` (B) `e^(itheta) cos 2theta` (C) `e^(-itheta) cos theta` (D) `e^(2itheta) cos 2theta`

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