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The unit vector veca and vecb are perpen...

The unit vector `veca` and `vecb` are perpendicular, and the unit vector `vecc` is inclined at an angle `theta` to both `veca` and `vecb`. If `vecc=alpha veca+betavecb+gamma(vecaxxvecb)`, then which one of the following is incorrect?

A

`alpha = cot theta , beta = sin theta , gamma^2 = cos 2 theta `

B

`alpha cos theta , beta = cos theta , gamma^2 = cos 2 theta `

C

`alpha = cos theta , beta = sin theta , gamma^2 = cos 2 theta `

D

`alpha = sin theta , beta = cos theta gamma^2 = - cos 2 theta `

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