1.

Let f(x)=e^x sgn (x+[x]) , where sgn is the signum function and [x] is the greatest integer function . Then

Answer»

`lim_(x to 0+)f(x)=0`
`lim_(x to 0+) f(x)=-1`
`lim_(x to 0+) f(x)=1`
`lim_(x to 0-) f(x)=1`

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