$\lim _{x \rightarrow 0} \frac{\cos 7 x^{\circ}-\cos 2 x^{\circ}}{x^2}$ का मान ज्ञात कीजिए।

  • A
    $\frac{-45}{2} \pi^2$
  • B
    $\frac{-45}{2} \pi$
  • C
    $\frac{-\pi^2}{1440}$
  • D
    $\frac{-\pi^2}{2880}$

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यदि $f(x) = -(\sin^2 x + \cos^5 x)$ है,तो $\lim_{x \rightarrow 0} \frac{f'(x)}{x}$ का मान ज्ञात कीजिए।

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