If \(\cos \alpha,\cos\beta, \cos \gamma\) are direction cosines of any straight line, then
Answer & explanation
Correct answer: option 4
\(\cos (2\alpha)+\cos (2\beta)+\cos (2\gamma)=2\left(\cos^2 \alpha+\cos^2 \beta+\cos^2 \gamma \right)-3\)
If \(\cos \alpha,\cos\beta, \cos \gamma\) are direction cosines of any straight line, then
Correct answer: option 4
\(\cos (2\alpha)+\cos (2\beta)+\cos (2\gamma)=2\left(\cos^2 \alpha+\cos^2 \beta+\cos^2 \gamma \right)-3\)