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CGP EDU Academic Team
Published on: August 14, 2026
Show that the lines whose direction-cosines are given by λ +2m +3n = 0 and 3 λ m – 4 λ n+ mn = 0 are perpendicular.
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Sol. x – 2y 2 2z = 3, 2x + y – 2z = – 3
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