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a, b, c are non-zero unit vectors inclin...

a, b, c are non-zero unit vectors inclined pairwise with the same angle `theta`, p, q, r are non-zero scalars satisfying `atimesb+btimesc=pa+qb+rc.` Now, answer the following questions. Q. `|(q+p)costheta+r|` is equal to

A

`(1+cos theta)sqrt(1-2 costheta)`

B

`2 sin^(2) theta/2|sqrt(1+2 cos theta)|`

C

`(1-sin theta)|sqrt(1+2 cos theta)|`

D

None of these

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The correct Answer is:
B
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