表达式6: "m" equals StartFraction, left parenthesis, "f" left parenthesis, "a" plus "h" , right parenthesis minus "f" left parenthesis, "a" , right parenthesis , right parenthesis Over "h" , EndFractionm=fa+h−fah
6
Equation of secant line
7
表达式8: "y" equals "m" left parenthesis, "x" minus "a" , right parenthesis plus "f" left parenthesis, "a" , right parenthesisy=mx−a+fa
8
Equation of tangent line
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表达式10: "y" equals "f" prime left parenthesis, "a" , right parenthesis left parenthesis, "x" minus "a" , right parenthesis plus "f" left parenthesis, "a" , right parenthesisy=f′ax−a+fa
