JEE Math Practice Question
The sum of all possible values of $$\theta \in[-\pi, 2 \pi]$$, for which $$\frac{1+i \cos \theta}{1-2 i \cos \theta}$$ is purely imaginary, is equal to :
- A.$$4 \pi$$
- B.$$3 \pi$$
- C.$$2 \pi$$
- D.$$5 \pi$$
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