The value of x for which the angle betwe...

The value of x for which the angle between `veca=2x^(2)hati+4xhatj + hatkand vecb=7hati-2hatj+hatk` is obtuse and the angle between `vecb` and the z-axis is acute and less then `pi//6`

`0 lt x lt 1/2`

`x gt 1/2`or `x lt 0`

`1/2 lt x lt 15`

No such value for x.

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