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Let veca,vecb and vecc be three vector...

Let `veca,vecb and vecc ` be three vectors such that `|veca |=sqrt(3),|vec b|=5 , vec b .vec c = 10` and the angle between `vec b and vec c is pi/3, if vec a ` is perpendicular to the vector `vec b xx vec c, then `|`veca xx (vecbxxvecc)|` is equal to __________.

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