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$5 \hat{\mathrm{i}}+\hat{\mathrm{j}}-3 \hat{\mathrm{k}}$ और $3 \overrightarrow{\mathrm{i}}-4 \overrightarrow{\mathrm{j}}+7 \overrightarrow{\mathrm{k}}$ का अदिश गुणनफल है :
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 $\cos \theta=$