[微積] 微積分可微判斷一題

[hongo1120 (hongo1120)]

f(x)= x, x rational
      0, x irrational

g(x)= x^2, x rational
      0,   x irrational

show that (1) f is not differentiable at x=0
          (2) g is differentiable at x=0 and give g'(0)


thanks

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