各位好:
(1)
1
g(x)= sin──, x≠0
x
0 , x＝0
则g(x)在x=0处是否连续?说明之.
(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.
刚碰到证明题,不知该如何下手?
烦请高手解说.
另外一问,请问证明比较多的书籍,可否推荐?
谢谢.

谢谢.这样我知道怎么写了,刚碰到证明有点不知怎下手谢谢解说