These Couple Lines

Geometry Level 4

3l+m+5n=06mn2nl+5lm=0\begin{aligned} 3 l +m +5 n & =& 0 \\ 6 m n-2 n l+5 l m& =& 0 \\ \end{aligned}

The pair of lines whose direction cosines are given by the two equations above are:

If you're looking to skyrocket your preparation for JEE-2015, then go for solving this set of questions.
Image Credit: Wikimedia Cone by Lars H. Rohwedder

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