Expression 4: StartFraction, "a" squared plus "b" squared minus "d" squared Over 2 times "a" times "b" , EndFraction equals cosine 120a2+b2−d2otted2·a·b=cos120
4
Expression 5: "d" Subscript, "o" "t" "t" "e" "d" , Baseline equals StartRoot, "a" squared plus "b" squared minus 2 times "a" times "b" cos 120 , EndRootdotted=a2+b2−2·a·bcos120
equals=
20.0 7 6 3 9 1 2 8 9 720.0763912897
5
Expression 6: "A" Subscript, "n" "g" "l" "e" "P" "i" "n" "k" , Baseline equals cosine to the negative 1st power StartFraction, "a" squared plus "d" squared minus "b" squared Over 2 times "a" times "d" Subscript, "o" "t" "t" "e" "d" , Baseline , EndFractionAnglePink=cos−1a2+d2otted−b22·a·dotted
equals=
1515
6
Expression 7:
7
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center: left parenthesis, negative 1 , 0 , right parenthesis−1,0
