Show that the lines with direction cosines: `(12)/(13) , (-3)/(13) , (-4)/(13), (4)/(13) ,(12)/(13) , (3)/(13) , (3)/(1

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Q 1814191059.     Show that the lines with direction cosines:
`(12)/(13) , (-3)/(13) , (-4)/(13), (4)/(13) ,(12)/(13) , (3)/(13) , (3)/(13), (-4)/(13), (12)/(13)`
are mutually perpendicular.

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(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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