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Let theta1 and theta2 (wheretheta1 lt th...

Let `theta_1` and `theta_2` (where`theta_1 lt theta_2)` are two solutions of `2cot^2theta – 5/(sin theta) + 4 = 0, theta in [0, 2pi)` then `int_(theta_1)^(theta_2) cos^2 3theta d theta` is equal to

A

`2pi/3`

B

`pi/3`

C

`2pi/9`

D

`pi/6`

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The correct Answer is:
B
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