수식 3: "P" equals left parenthesis, "V" Subscript, "s" , Baseline StartFraction, "R" Subscript, "L" , Baseline Over "R" Subscript, "s" , Baseline plus "R" Subscript, "L" , Baseline , EndFraction , right parenthesis squared times StartFraction, 1 Over "R" Subscript, "L" , Baseline , EndFraction left brace, "R" Subscript, "L" , Baseline greater than 0 , right braceP=VsRLRs+RL2·1RLRL>0
3
수식 4: "P" Subscript, 1 , Baseline equals left parenthesis, "V" Subscript, "s" , Baseline StartFraction, "x" Over "R" Subscript, "s" , Baseline plus "x" , EndFraction , right parenthesis squared times StartFraction, 1 Over "x" , EndFraction left brace, "x" greater than 0 , right braceP1=VsxRs+x2·1xx>0
4
수식 5: StartFraction, "d" Over "d" "x" , EndFraction "P" Subscript, 1 , Baseline equals 0ddxP1=0
