1.

Let f(x)=(sin4pi[x])/(1+[x]^(2)), where [x] is the greatest integer lex, then :

Answer»

`f(X)` is not differentiable at some points
`f'(x)` exists but is different from 0
`f'(x)=0` for all x
`f'(x)=0` but f is not a constant FUNCTION.

Answer :C


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