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Check if lines with direction-cosines :...

Check if lines with direction-cosines :
`lt (12)/(13) , - (3)/(13) , - (4)/(13) gt , lt (4)/(13) , (12)/(13), (3)/(13) gt , lt (3)/(13) , (4)/(13) , (12)/(13) gt ` are mutually perpendicular .

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