Mathematics · Three Dimensional Geometry
The angle between the straight lines whose direction cosines l, m, n are given by the equations 2l = m - n = 0 and mn + nl + lm = 0, is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1π - cos-149
- 2cos-189
- 3π2✓
- 4π3
Correct answer
π2
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