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

The value of `x` for which the angle between ` vec a=2x^2 hat i+4x hat j+ hat ka n d vec b=7 hat i-2 hat j+ hat k` is obtuse and the angle between `b` and the z-axis acute and less that `pi//6` is `a1//2orx<0` d. none of these

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