Question:
Write a unit vector in the direction of the sum of the vectors $\overrightarrow{\mathrm{a}}=(2 \hat{\mathrm{i}}+2 \hat{\mathrm{j}}-5 \hat{\mathrm{k}})$ and $\overrightarrow{\mathrm{b}}=(2 \hat{\mathrm{i}}+\hat{\mathrm{j}}-7 \hat{\mathrm{k}})$
Solution:
