ધારો કે $f(x) = \frac{1}{3} x \sin x - (1 - \cos x)$. સૌથી નાનો ધન પૂર્ણાંક $k$ શોધો જેથી $\lim_{x \rightarrow 0} \frac{f(x)}{x^k} \neq 0$ થાય.

  • A
    $4$
  • B
    $3$
  • C
    $2$
  • D
    $1$

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