Question

# If the line $$\vec{OR}$$ makes angles $$\theta_1, \theta_2, \theta_3$$ with the planes $$XOY, YOZ, ZOX$$ respectively, then $$\cos^2\theta_1+\cos^2\theta_2+\cos^2\theta_3$$ is equal to

A
1
B
2
C
3
D
4

Solution

## The correct option is A $$1$$If the line $$\vec{OR}$$ makes angles $$\theta_1, \theta_2, \theta_3$$ with the planes $$XOY, YOZ, ZOX$$ respectively, then $$\cos^2\theta_1+\cos^2\theta_2+\cos^2\theta_3$$ $$=1$$Mathematics

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