3-d

Question: If a line makes $\alpha ,\beta ,\gamma $ with the positive direction of $x,\ y$ and z-axis respectively. Then, ${{\cos }^{2}}\alpha +{{\cos }^{2}}\beta +{{\cos }^{2}}\gamma $ is



1) 1/2
2) –1/2
3) –1
4) 1
Solution: Explanation: No Explanation
System of co-ordinates Direction cosines and direction ratios Projection

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