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[" 19.The real value of "theta" for whic...

[" 19.The real value of "theta" for which the expression "(1+i cos theta)/(1-2i cos theta)" is a real number,is "],[[" (a) "n pi+(pi)/(4)," (b) "n pi+(-1)^(n)(pi)/(4)," (c) "2n pi+-(pi)/(2)," (d) none of theses "]]

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