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Co - ordinate Geometry 3D Geometry

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The lines whose direction cosine are given by the relation a²l+ b²m + c²n = 0 and mn + nl + lm = 0 are parallel if

A. (a² - b² + c²)² = 4a²c²

B. (a² + b² + c²) = 4a²c²

C. (a² - b² + c²) = a²c²

D. (a² - b² + c²) = 2a²c²

E. None of the above

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Correct choice: A

Explanation:

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Eamcet Mathematics Co - ordinate Geometry 3D Geometry

Eamcet Mathematics
Co - ordinate Geometry 3D Geometry