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If |a|=|b|=|c|=1anda*b=b*c=c.a=costheta,...

If `|a|=|b|=|c|=1anda*b=b*c=c.a=costheta,`then the maximum value of `theta` is

A

`pi/3`

B

`pi/2`

C

`(2pi)/3`

D

`(2pi)/5`

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The correct Answer is:
C
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