Find the values of \( x \) for which the angle between the P vector...

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Find the values of \( x \) for which the angle between the
P vectors \( \quad \vec{a}=2 x^{2} \hat{i}+4 x \hat{j}+\hat{k} \quad \) and \( \quad \vec{b}=7 \hat{i}-2 \hat{j}+x \hat{k} \)

W vector is obtuse.
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