3-d

Question: If $\alpha ,\beta ,\gamma $ be the angles which a line makes with the co-ordinate axes, then

1) ${{\sin }^{2}}\alpha +{{\cos }^{2}}\beta +{{\sin }^{2}}\gamma =1$

2) ${{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma =1$

3) ${{\sin }^{2}}\alpha +{{\sin }^{2}}\beta +{{\sin }^{2}}\gamma =1$

4) ${{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\sin }^{2}}\gamma =1$

Solution:

Explanation: No Explanation

System of co-ordinates Direction cosines and direction ratios Projection

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