[" 42.If "(1+i cos theta)/(1-2i cos thet...

[" 42.If "(1+i cos theta)/(1-2i cos theta)" is Imaginary then "theta=],[[" 1) "2m+(pi)/(2)," 2) "2 pi pi-(pi)/(2)],[" 3) "2m+-(pi)/(2)," 4) "n pi+-(pi)/(4)]]

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