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The vectors 2hati-lamdahatj+3lamdahatk a...

The vectors `2hati-lamdahatj+3lamdahatk and (1+lamda)hati-2lamdahatj+hatk` include an acute angle for (A) all values of m (B) `lamdalarr2` (C) lamdagt-12` (D) `lamdaepsilon [-2,-1/2]`

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