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JEE Mains · Maths · STD 12 - 11. three dimension geometry

ધારોકે બે રેખાઓના દિક્કોસાઈનો સમીકરણો \(4 l+ m - n =0\) અને \(2 m n+10 n l+3 l m=0\) નું સમાધાન કરે છે. તો આ રેખાઓ વચ્ચેના લઘુકોણનું કોસાઈન ___ છે.

  1. A \( \frac{10}{\sqrt{38}} \)
  2. B \( \frac{20}{3\sqrt{38}} \)
  3. C \( \frac{10}{7\sqrt{38}} \)
  4. D \( \frac{10}{3\sqrt{38}} \)
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Answer & Solution

Correct Answer

(D) \( \frac{10}{3\sqrt{38}} \)

Step-by-step Solution

Detailed explanation

Direction cosines of two lines satisfy the equation \(\Rightarrow 4 \ell+m-n=0\)\(\quad\)...(1) \(2 m n+10 n \ell+3 \ell m=0\)\(\quad\)...(2) & we know \(\Rightarrow \ell^2+ m ^2- n ^2=1\)\(\quad\)...(3) \(\Rightarrow n =4 \ell+ m\) putting in eqn. (1)…
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