1.

let f(x)=(sin4pi[x])/(1+[x]^(2)), where px] is the greatest integer less than or equal to x then

Answer»

f(x) is not DIFFERENTIABLE at some points
f'(x) exits but is DIFFERENT from zero
f'(x) for all x
f'(x)=0 but f is not a constant

Answer :C


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