WBJEE 2019 Math Solved Paper

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Question : 72 of 75

Marks: +1, -0

If θ ∊ R and

1−icosθ

1+2icosθ

is real number, then θ will be (when I : Set of integers)

(2n + 1)
π
2
, n ∊ I
3nπ
2
, n ∊ I
nπ , n ∊ I
2nπ, n ∊ I

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