Find the condition that the vectors \( \vec{a}=k \hat{i}+l \hat{j} ...

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Find the condition that the vectors \( \vec{a}=k \hat{i}+l \hat{j} \) and \( \vec{b}=l \hat{i}+k \hat{j} \quad(k, l \neq 0) \) are parallel.
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