fx^.. . F(x+h)—fx = limit of ^^-^ ~ ^^ X 1"^!^ of"— ^ — —r^ — ^
...■^— li n Now h and H diminish without limit together, and the first limit would be D(j>x, but iha. Tfx is in the place of x. It is, therefore, what D(f)X becomes whenfx is written for x. The second limit is Dfx ; whence -r\ r- T\ /with . R afterwardsN ^ ^ Ji^fx = J)
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