Expression 6: "a" Subscript, 1 , Baseline equals StartFraction, "x" Over "a" , EndFractiona1=xa
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Expression 7: "d" Subscript, 1 , Baseline equals left parenthesis, "x" minus "a" minus "d" , right parenthesis squared times StartFraction, 1 minus "v" Over "d" squared , EndFraction plus "v"d1=x−a−d2·1−vd2+v
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Expression 8: "r" Subscript, 1 , Baseline equals left parenthesis, "x" minus "a" minus "d" minus "s" minus "r" , right parenthesis squared times StartFraction, "v" Over "r" squared , EndFractionr1=x−a−d−s−r2·vr2
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Expression 9: left brace, "x" less than 0 : 0 , "x" less than "a" : "a" Subscript, 1 , Baseline , "x" less than "a" plus "d" : "d" Subscript, 1 , Baseline , "x" less than "a" plus "d" plus "s" : "v" , "x" less than "a" plus "d" plus "s" plus "r" : "r" Subscript, 1 , Baseline , 0 , right bracex<0:0,x<a:a1,x<a+d:d1,x<a+d+s:v,x<a+d+s+r:r1,0