1.

The real value of θ for which the expression (1 + icosθ)/(1 - 2icosθ) is a real number is:(A) nπ + π/4(B)  nπ + (-1)nπ/4(C) 2nπ ± π/2(D) none of these.

Answer»

Answer is (C) 2nπ ± π/2



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