If 3 /2+cos teta +i sin teta =x+iy then (x-1 )(x-3).
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3/2+cos theta = x
x = 3+2cos theta /2
put this value in above equation you will get
(cos^2theta - 1) / 2 - 3/4
x = 3+2cos theta /2
put this value in above equation you will get
(cos^2theta - 1) / 2 - 3/4
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