यदि $f(r) = \pi r^2$ है,तो $\lim_{h \to 0} \frac{f(r + h) - f(r)}{h} = $

  • A
    $\pi r^2$
  • B
    $2\pi r$
  • C
    $2\pi$
  • D
    $2\pi r^2$

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