The value of 'x' for which the angle between the vectors \[\overset{\to }{\mathop{a}}\,=2{{x}^{2}}\hat{i}+4x\hat{j}+\hat{k}\] and \[\overset{\to }{\mathop{b}}\,=7\hat{i}-2\hat{j}+x\hat{k}\] is obtuse are

The value of 'x' for which the angle between the vectors \[\overset{\t

1.	The value of 'x' for which the angle between the vectors \[\overset{\to }{\mathop{a}}\,=2{{x}^{2}}\hat{i}+4x\hat{j}+\hat{k}\] and \[\overset{\to }{\mathop{b}}\,=7\hat{i}-2\hat{j}+x\hat{k}\] is obtuse are
A.	\[\operatorname{x} < 0\]
B.	\[x>\frac{1}{2}\]
C.	\[0<x<\frac{1}{2}\]
D.	\[x\in R\]
Answer» D. \[x\in R\]

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The value of 'x' for which the angle between the vectors \[\overset{\to }{\mathop{a}}\,=2{{x}^{2}}\hat{i}+4x\hat{j}+\hat{k}\] and \[\overset{\to }{\mathop{b}}\,=7\hat{i}-2\hat{j}+x\hat{k}\] is obtuse are

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