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If (2 + 3 isin theta)/(1- 2isin theta) i...

If `(2 + 3 isin theta)/(1- 2isin theta)` is purely imaginary , then `cos^(2) theta =`

A

`1//2`

B

`3//2`

C

`1//3`

D

`2//3`

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The correct Answer is:
D
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