Let a, b and c be non-zero vectors such ...

Let a, b and c be non-zero vectors such that `(vecaxxvecb)xxvecc=(-1)/(4)|vecb||vecc|veca`.
If `theta` the acute angle between the vectors b and c, then the angle
between a and c is equal to

A

`(2pi)/(3)`

B

`(pi)/(4)`

C

`(pi)/(3)`

D

`(pi)/(2)`

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The correct Answer is:

D

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