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Let veca,vecb,vecc be three vectors sati...

Let `veca,vecb,vecc` be three vectors satisfying `vecaxxvecb=2vecaxxvecc, |veca|=|vecc|=1, |vecb|=4` and `|vecbxxvecc|=sqrt(15)` If `vecb-2vecc=lambdaveca` then `lambda=`

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If three vectors veca, vecb,vecc are such that veca ne 0 and veca xx vecb = 2(veca xx vecc),|veca|=|vecc|=1, |vecb|=4 and the angle between vecb and vecc is cos^(-1)(1//4) , then vecb-2vecc= lambda veca where lambda is equal to: