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[" If "theta" is real then the modulus o...

[" If "theta" is real then the modulus of "(1)/(1+cos theta+i sin theta)" is "],[[" (A) "(1)/(2)sec(theta)/(2)," (B) "(1)/(2)cos(theta)/(2)],[" (C) "sec(theta)/(2)," (D) "cos(theta)/(2)]]

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