[極限] 證明極限連續,可微
各位好:
(1)
1
g(x)= sin──, x≠0
x
0 , x=0
則g(x)在x=0處是否連續?說明之.
(2)
1
f(x)= xsin── ,x≠0
x
0 ,x=0
show that f is continuous at 0 , but f is not differentiable at 0.
剛碰到證明題,不知該如何下手?
煩請高手解說.
另外一問,請問證明比較多的書籍,可否推薦?
謝謝.
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