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aa n dc are unit vectors and |b|=4 . The...

`aa n dc` are unit vectors and `|b|=4` . The angel between `aa n dc` is `cos^(-1)(1//4)a n db-2c=lambdaadot` The value of `lambda` is `3,-4` b. `1//4,3//4` c. `-3,4` d. `-1//4,3//4`

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