The coordinates of point \( P \) are \( (3,-2,6) \) with respect to origin \( O \), then the dir....

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The coordinates of point \( P \) are \( (3,-2,6) \) with respect
\( \mathrm{P} \)
to origin \( O \), then the direction cosines are
(1) \( 3,-2,6 \)
(2) \( \frac{1}{3}, \frac{-1}{2}, \frac{1}{6} \)
(3) \( \frac{3}{\sqrt{7}}, \frac{-2}{\sqrt{7}}, \frac{6}{\sqrt{7}} \)
(4) \( \frac{3}{7}, \frac{-2}{7}, \frac{6}{7} \)


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