Answer :

Here, angle between and is obtuse


So,


14x2 – 8x + x ≤ 0


14x2 – 7x ≤ 0


2x2 – x ≤ 0


x(2x – 1)≤ 0



or __________(1)


Now, angle between and Z-axis is acute


So,


x0 ___________(2)


From (1) and (2) .

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