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Let veca and vecc be unit vectors such t...

Let `veca` and `vecc` be unit vectors such that `|vecb|=4` and `vecaxxvecb=2(vecaxxvecc)`. The angle between `veca` and `vecc` is `cos^(-1)(1/4)`. If `vecb-2vecc=lamdaveca` then `lamda=`

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