Let a be a conostant and let f(x)={x^(3)-ax, if x<1                                                      {x^(4), if x>=1 then (a) f is continuous at 0 only if a=0 (b) f is differentiable at 1 for all a (c) f'(1)=3-a for all a (d) f'(0) exists only if a=0 (e) none of these

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