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If1 + sin theta + sin^2 theta + …" to ...

If`1 + sin theta + sin^2 theta + …" to " oo = 4 + 2 sqrt3, 0 lt theta lt pi, theta ne pi//2`, then

A

`theta = pi//6`

B

`theta = pi//3`

C

`theta = pi//3 or pi//6`

D

`theta = pi//3 or 2pi//3`

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The correct Answer is:
D
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