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If hata,hatb and hatc are three unit vec...

If `hata,hatb and hatc` are three unit vectors inclined to each other at an angle `theta`. The maximum value of `theta` is

A

`cos^(-1)[(costheta)/(cos(theta//2))]`

B

`sin^(-1)[(sintheta)/(sin(theta//2))]`

C

`sin^(-1)[(costheta)/(cos(theta//2))]`

D

`cos^(-1)[(sintheta)/(sin(theta//2))]`

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A
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