Class 12 Three Dimensional Geometry · Mcq Single Correct1 Marksdirection_cosines
Class 12 Maths · Three Dimensional Geometry · Mcq Single Correct #2
A line makes angles α,β,γ with the positive coordinate axes. Find cos 2α+cos 2β+cos 2γ.
✅ Step-by-Step Solution
Final Answer: Option (B): −1
- Use cos 2α=2cos²α−1 and cos²α+cos²β+cos²γ=1. The sum is 2−3=−1.
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The length of perpendicular drawn from point (2, 5, 7) on line x/1 = y/0 = z/0 is