1.

If < l, m, n> and are the direction cosines of two straight lines then find the maximum value of the expression lp + mq + nr + (mr-qn)² + (np- rl)² + (lq - pm)².

Answer» If < l, m, n> and

are the direction cosines of two straight lines then find the maximum value of the expression lp + mq + nr + (mr-qn)² + (np- rl)² + (lq - pm)².



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