수식 4: "g" left parenthesis, "x" , right parenthesis equals StartFraction, "d" Over "d" "x" , EndFraction "f" left parenthesis, "x" , right parenthesisgx=ddxfx
4
수식 5: "h" left parenthesis, "x" , right parenthesis equals StartFraction, "d" Over "d" "x" , EndFraction "g" left parenthesis, "x" , right parenthesishx=ddxgx