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[" 5.Let "A={theta in(-(pi)/(2),pi):(3+2...

[" 5.Let "A={theta in(-(pi)/(2),pi):(3+2i sin theta)/(1-2i sin theta)" is purely imaginary "}],[" Then,the sum of the elements in "A" is (2019Main,"9" Jan I) "],[[" (a) "(3 pi)/(4)," (b) "(5 pi)/(6)," (c) "pi," (d) "(2 pi)/(3)]]

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