The values of \( k \) for which \( |k \vec{a}||\vec{a}| \) and \( k...

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The values of \( k \) for which \( |k \vec{a}||\vec{a}| \) and \( k \vec{a}+\frac{1}{2} \vec{a} \) is parallel to \( \vec{a} \) holds true are
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