Expression 9: "k" left parenthesis, "a" , "k" Subscript, "a" "p" , Baseline left parenthesis, "a" , right parenthesis , left parenthesis, "x" , "y" , right parenthesis , right parenthesis equals 0ka,kapa,x,y=0
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Hidden Label: "f" left parenthesis, "a" , right parenthesisfa
Expression 12: "d" Subscript, "o" "t" , Baseline left parenthesis, "u" , "v" , right parenthesis equals "u" . "x" "v" . "x" plus "u" . "y" "v" . "y"dotu,v=u.xv.x+u.yv.y
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Expression 13: "d" Subscript, "o" "t" 2 , Baseline left parenthesis, "u" , right parenthesis equals "d" Subscript, "o" "t" , Baseline left parenthesis, "u" , "u" , right parenthesisdot2u=dotu,u
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Expression 14: "a" Subscript, "b" "s" , Baseline left parenthesis, "u" , right parenthesis equals StartRoot, "d" Subscript, "o" "t" 2 , Baseline left parenthesis, "u" , right parenthesis , EndRootabsu=dot2u
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Expression 15: "u" Subscript, "n" "i" "t" , Baseline left parenthesis, "u" , right parenthesis equals StartFraction, "u" Over "a" Subscript, "b" "s" , Baseline left parenthesis, "u" , right parenthesis , EndFractionunitu=uabsu
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Expression 16: "o" Subscript, "r" "t" "h" "o" , Baseline left parenthesis, "u" , right parenthesis equals left parenthesis, negative "u" . "y" , "u" . "x" , right parenthesisorthou=−u.y,u.x