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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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