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Let veca, vecb and vecc be three unit ve...

Let `veca, vecb and vecc` be three unit vectors such that `veca` is perpendicular to the plane of `vecb` and `vecc`. if the angle between `vecb and vecc` is `(pi)/(3)`, then `|veca xx vecb -veca xx vecc|^(2)` is equal to

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