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The lines whose direction cosine are given by the relation a^2 l+b^2 m+c^2n=0 and mn+nl+lm=0 are parallel if 1.(a^2-b^2+c^2)^2=4a^2c^2 2.(a^2+b^2+c^2)^2=4a^2c^2 3.(a^2-b^2+c^2)^2=a^2c^2 4.None of these

The lines whose direction cosine are given by the relation a^2 l+b^2 m+c^2n=0 and mn+nl+lm=0 are parallel if
1.(a^2-b^2+c^2)^2=4a^2c^2
2.(a^2+b^2+c^2)^2=4a^2c^2
3.(a^2-b^2+c^2)^2=a^2c^2
4.None of these

Grade:12

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
4 years ago
576-550_1.PNG576-1935_2.PNG

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