If directional ratios normal to plane are 1,-1,1 then directional cosines are
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DC's =[a/(a+b+c),b/(a+b+c),c/(a+b+c)]
where a,b,c are the Dr's
(1/√3,-1/√3,1/√3]
where a,b,c are the Dr's
(1/√3,-1/√3,1/√3]
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