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यदि $\mathrm{a}=\overline{\mathrm{i}}+2 \overline{\mathrm{j}}+3 \overline{\mathrm{k}}$ और $\mathrm{b}=3 \mathrm{i}+2 \mathrm{j}+\mathrm{k}$ तो $\cos \theta=$
यदि $|\overrightarrow{\mathrm{a}}|=\sqrt{26},|\overrightarrow{\mathrm{b}}|=7$ और $|\overrightarrow{\mathrm{a}} \times \overrightarrow{\mathrm{b}}|=35$ तो $\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{b}}=$
यदि $\vec{a} \vec{b} \vec{c}$ इकाई सदिश हो जिसमें कि $\vec{a}+\vec{b}+\vec{c}=0$ तो $\vec{a} \cdot \vec{b}+\vec{b} \cdot \vec{c}+\vec{c} \cdot \vec{a}$ का मान है :