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Let f be defined on R by f(x)=x^(4)sin(1...

Let f be defined on R by` f(x)=x^(4)sin(1/x)`, if` x!=0` and f(0)=0 then (a)` f'(0)` doesn't exist (b) `f'(2-)` doesn't exist (c)` f''` is not continous at x=0 (d)` f''(0)` exist but` f'''` is not continuous at` x=0`

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