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[" 5.If "z=(1)/(1-cos theta-i sin theta)...

[" 5.If "z=(1)/(1-cos theta-i sin theta)" then "Re(z)=.......],[[" (A) "0," (B) "(1)/(2)],[" (C) "cot(theta)/(2)," (D) "(1)/(2)cot(theta)/(2)]]

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