1.

The value of 'x' for which the angle between bara=2x^(2)bari+4barxj+bark and barb=7bari -2barj+xbark is obtuse and the angle between barb and Z-axis is acute and less then pi//6, are

Answer»

`0ltxlt1/2`
`1/2ltxlt15`
`xgt1/2 or XLT0`
No VALUE of x

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