Expression 47: "f" prime left parenthesis, "x" , right parenthesis equals StartFraction, "f" left parenthesis, "b" , right parenthesis minus "f" left parenthesis, "a" , right parenthesis Over "b" minus "a" , EndFractionf′x=fb−fab−a
47
48
powered by
powered by
"a"a
"b"b
( "a" plus Delta "x" , "f" ( "a" plus Delta "x" )(a+Δx,f(a+Δx)