If f(x)={{:(x^(2)"sin"(1)/(x)",",x ne0),...

If `f(x)={{:(x^(2)"sin"(1)/(x)",",x ne0),(k",",x=0):}`

f has a continous derivative `AA x in R`

f is a bounded function

f has an global minimum at `x=0`

f" is continous `AA x in R`

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A, C, D

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