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f(x)
=x^2.sin(1/x) ; x≠0
=0 ; x=0
lim(x->0)x^2.sin(1/x) =0 =f(0)
x=0, f(x) 连续
f'(0)
=lim(h->0) [h^2.sin(1/h)-f(0)]/h
=lim(h->0) h.sin(1/h)
=0
x=0, f(x) 可导
=x^2.sin(1/x) ; x≠0
=0 ; x=0
lim(x->0)x^2.sin(1/x) =0 =f(0)
x=0, f(x) 连续
f'(0)
=lim(h->0) [h^2.sin(1/h)-f(0)]/h
=lim(h->0) h.sin(1/h)
=0
x=0, f(x) 可导
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