3-d

Question: If $\alpha ,\,\,\beta ,\,\gamma $ be the direction angles of a vector and $\cos \alpha =\frac{14}{15}$, $\cos \beta =\frac{1}{3}$ then $\cos \gamma $=

1) $\pm \frac{2}{15}$

2) $\frac{1}{5}$

3) $\pm \frac{1}{15}$

4) None of these

Solution:

Explanation: No Explanation

System of co-ordinates Direction cosines and direction ratios Projection

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