式18: left parenthesis, "X" , "Y" , right parenthesisX,Y
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式19: left parenthesis, "L" Subscript, 1 , Baseline cos "a" plus "L" Subscript, 2 , Baseline cos left parenthesis, "a" plus "b" , right parenthesis , "L" Subscript, 1 , Baseline sin "a" plus "L" Subscript, 2 , Baseline sin left parenthesis, "a" plus "b" , right parenthesis , right parenthesisL1cosa+L2cosa+b,L1sina+L2sina+b
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式20: "c" equals StartFraction, "X" squared plus "Y" squared minus "L" squared minus "L" squared Over 2 "L" Subscript, 1 , Baseline "L" Subscript, 2 , Baseline , EndFractionc=X2+Y2−L21−L222L1L2
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式21: "s" equals StartRoot, 1 minus "c" squared , EndRoots=1−c2
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式22: "a" equals "A" left parenthesis, StartFraction, negative "X" "L" Subscript, 2 , Baseline "s" plus left parenthesis, "L" Subscript, 1 , Baseline plus "L" Subscript, 2 , Baseline , right parenthesis "c" "Y" Over "L" squared plus "L" squared plus 2 "L" Subscript, 1 , Baseline "L" Subscript, 2 , Baseline "c" , EndFraction , StartFraction, left parenthesis, "L" Subscript, 1 , Baseline plus "L" Subscript, 2 , Baseline "c" , right parenthesis "X" plus "L" Subscript, 2 , Baseline "Y" "s" Over "L" squared plus "L" squared plus 2 "L" Subscript, 1 , Baseline "L" Subscript, 2 , Baseline "c" , EndFraction , right parenthesisa=A−XL2s+L1+L2cYL21+L22+2L1L2c,L1+L2cX+L2YsL21+L22+2L1L2c
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式23: "b" equals "A" left parenthesis, "s" , "c" , right parenthesisb=As,c
