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Let vec a , vec ba n d vec c be three v...

Let ` vec a , vec ba n d vec c` be three verctors such that ` vec a!=0,| vec a|=| vec c|=1,| vec b|=4` and `| vec bxx vec c|=sqrt(15)dot` If ` vec b-2 vec c=lambda vec a ,` then find the value of `lambda`

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