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Let |veca| = 3, |vecb| = 5, vecb.vecc= 1...

Let `|veca| = 3, |vecb| = 5, vecb.vecc= 10`, angle between `vecb` and `vecc` equal to `pi/3`. If `veca` is perpendicular `vecb xx vecc` then find the value of `|veca xx (vecb xx vecc)| `

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