Law of cosines - triples: Difference between revisions
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</pre>
=={{header|
<lang ruby>grouped = (1..13).to_a.repeated_permutation(3).group_by do |a,b,c|
sumaabb, ab = a*a + b*b, a*b
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</pre>
=={{header|zkl}}==
<lang zkl>fcn tritri(N=13){
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