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Which of the following plots correspond to a function whose derivative is continuous?

 

  1. (i) and (ii)
  2. (ii) and (iii)
  3. (iii) and (iv)
  4. (ii) and (iv)
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Correct answer is Option (D).

Graph (II) is a parabola whose equation is kind of 

$Y=4x^2+6$ which is differentiable .

Graph (IV) is also very known graph ,

$\large y=x^3$ which also differentiable.

So correct answer is (D).

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