式8: left parenthesis, "x" minus left parenthesis, StartFraction, "a" Over 2 , EndFraction plus "d" , right parenthesis , right parenthesis squared plus left parenthesis, "y" minus "d" "t" , right parenthesis squared equals left parenthesis, "d" "t" , right parenthesis squaredx−a2+d2+y−dt2=dt2
8
式9: left parenthesis, "a" , "a" squared , right parenthesisa,a2
9
式10: left parenthesis, StartFraction, "a" Over 2 , EndFraction plus "d" , "d" "t" , right parenthesisa2+d,dt
10
式11: left parenthesis, StartFraction, "a" Over 2 , EndFraction plus "d" , 0 , right parenthesisa2+d,0
11
式12: left parenthesis, StartFraction, "a" Over 2 , EndFraction , 0 , right parenthesisa2,0
12
式13: left parenthesis, 0 , negative "a" squared , right parenthesis0,−a2
13
式14: left parenthesis, "x" minus 2 "d" times StartFraction, left parenthesis, 1 minus "t" , right parenthesis Over 1 plus "t" , EndFraction , right parenthesis squared plus left parenthesis, "y" minus left parenthesis, negative "a" squared plus 2 "d" , right parenthesis , right parenthesis squared equals left parenthesis, 2 "d" times StartFraction, left parenthesis, 1 minus "t" , right parenthesis Over 1 plus "t" , EndFraction , right parenthesis squaredx−2d·1−t1+t2+y−−a2+2d2=2d·1−t1+t2
14
式15: left parenthesis, 2 "d" times StartFraction, left parenthesis, 1 minus "t" , right parenthesis Over 1 plus "t" , EndFraction , negative "a" squared plus 2 "d" , right parenthesis2d·1−t1+t,−a2+2d
15
式16: left parenthesis, 0 , negative "a" squared plus 2 "d" , right parenthesis0,−a2+2d
