Mathematics · Complex Numbers
The real value of θ for which the expression 1 + i cos(θ)1 - 2i cos(θ) is a real number is:
- 1None of these
- 22nπ ± π2✓
- 3nπ + (-1)nπ4
- 4nπ + π4
Correct answer
2nπ ± π2
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