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a, b ,c are three unit of vectors, a and b are perpendicular to each other and vector c is equally inclined to both a and b at an angle `theta`. If `c=alphaa+betab+(atimesb)gamma`, where `alpha, beta and gamma` are constant, then

A

`alpha=beta=costheta`

B

`alpha=costheta,beta=sintheta`

C

`gamma^(2)=cos2theta`

D

`gamma^(2)=-cos2theta`

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