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The values of x for which the angle betw...

The values of `x` for which the angle between ` vec a=2x^2\ hat i+4x hat j+ hat k ,\ vec b=7 hat i-2 hat j+x hat k` is obtuse and the angle between ` vec b` and the z-axis is acute and less than `pi/6` are `x >1/2or\ x<0` b. `0

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