Question: For the following proof the image is how i proceeded to prove it but i need to take the following approach : 4.2.2 Let /R

For the following proof the image is how i proceeded to prove it but i need to take the following approach :

4.2.2 Let /R - R be defined by / (x) = X, IfxEQ 1x2, ifXER- Q' Using only the definition of derivatives and Lemma 4.22, determine whether or not fis differentiable at 0. If it is find /(0); if it is not, show why not. Let / (x ) = x3 where x E Q lim (x + A) - [(x) h = lim (x+ hj3 -x] h = lim c' + 3xzh + 3xh?+ 43 -x3 h-0 = lim 3x

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