Problem

Problem

The angles which the vector A=3i^+6j^+2k^\mathbf{A} = 3\hat{i} + 6\hat{j} + 2\hat{k} makes with the co-ordinate axes are a. cos⁡−137,cos⁡−167\cos^{-1} \frac{3}{7}, \cos^{-1} \frac{6}{7} and cos⁡−127\cos^{-1} \frac{2}{7} b. cos⁡−147,cos⁡−157\cos^{-1} \frac{4}{7}, \cos^{-1} \frac{5}{7} and cos⁡−137\cos^{-1} \frac{3}{7} c. cos⁡−137,cos⁡−147\cos^{-1} \frac{3}{7}, \cos^{-1} \frac{4}{7} and cos⁡−117\cos^{-1} \frac{1}{7} d. None of these

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