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If 0 le theta le pr, cos 6theta + cos 4t...

If `0 le theta le pr, cos 6theta + cos 4theta + cos 2theta + 1 =0` then the ascending order of the values of `theta` is

A

`pi//6, pi//4, pi//2, 3pi//4, 5pi//6`

B

`pi//6, pi//4, pi//3, pi//2, 3pi//2`

C

`pi//4, pi//3, pi//2, 3pi//4, 2pi//3`

D

`pi//3, pi//2, 3pi//4, 2pi//3, 5pi//6`

Text Solution

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The correct Answer is:
A
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