Write down the condition for lines with direction cosines l1, m1, n1 and l2, m2 and n2 to be perpendicular?

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Write down the condition for lines with direction cosines l1, m1, n1 and l2, m2 and n2 to be perpendicular?

Safeer PP 11th Oct, 2021

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Safeer PP 11th Oct, 2021

l1l²+m¹m²+n¹n²=0

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