Re: [考古] 91交大
※ 引述《kusorz (^~^)》之銘言:
: suppose the f is one to one and f(1)=2,f(2)=3,f'(1)=1,f'(2)=3,f'(3)=5
: find (f^-1)'(2)=?
-1
f(1)=2 , f (2)=1
-1 -1
(f )'(2) = 1/f'(f (2)) = 1/f'(1) = 1/1 = 1
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