[微分]
┌ 2 1
│ X sin─ ，X≠0
Let f(x)=│ X
│ 0 ，X＝0
└
(1) Is f(x) differentiable at x=0 ?
(2) Is f'(x) continuous at x=0 ?
Ans: (1)可微，f'(0)=0
(2)不連續，(∵ lim f'(x)不存在)
X→0
(上面是課本答案...)
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