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Let vec a,vecb,vec c be three vectors ...

Let `vec a,vecb,vec c` be three vectors such that `vec a != 0, and vec a xx vec b=2vec a xx vec c,|veca|=|vec c|=1,|vec b|=4|vec axx vec c|=sqrt15` If `vec b-2vec c=lambda vec a`, then `lambda` equal to

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