1.
The vector (i^×ab)i^+(j^×ab)j^+(k^×ab)k^(\hat{i} \times \vec{a} \cdot \vec{b})\hat{i} + (\hat{j} \times \vec{a} \cdot \vec{b})\hat{j} + (\hat{k} \times \vec{a} \cdot \vec{b})\hat{k} is equal to