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Vector Addition

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Question

If $\vec{a,} \vec{b,} \vec{c}$ are non-coplanar vectors, then find the value of $\frac{\vec{a} \cdot (\vec{b} \times \vec{c})}{(\vec{c} \times \vec{a}) \cdot \vec{b}} + \frac{\vec{b} \cdot (\vec{a} \times \vec{c})}{\vec{c} \cdot (\vec{a} \times \vec{b})}$

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