Expression 6: "f" Subscript, "d" "o" "t" , Baseline left parenthesis, "a" , "b" , right parenthesis equals "a" . "x" times "b" . "x" positive "a" . "y" times "b" . "y"fdota,b=a.x·b.x+a.y·b.y
6
norm(v) "V" Subscript, "n" "o" "r" "m" , Baseline equals StartFraction, "V" Over distance left parenthesis, "V" , left parenthesis, 0 , 0 , right parenthesis , right parenthesis , EndFractionVnorm=VdistanceV,0,0