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

The values of x for which the angle between the vectors `veca = xhati - 3hatj - hatk` and `vecb = 2xhati + xhatj - hatk` is acute and the angle between b and y-axis lies between `pi/2` and `pi` are:

`xgt0`

`xlt0`

`xgt1only`

`xlt-1` only

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