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The values of 'theta' satisfying sin7 th...

The values of `'theta'` satisfying `sin7 theta = sin 4theta - sin theta` in `0 lt theta lt pi//2` are

A

`pi//9 , pi//4`

B

`pi//3, pi//9`

C

`pi//6, pi//4`

D

`pi//3, pi//4`

Text Solution

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The correct Answer is:
A
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