दिया गया है कि $\frac{d}{d x}\left[\int_0^{\phi(x)} f(t) d t\right]=f(\phi(x)) \cdot \phi^{\prime}(x)$. यदि $\int_0^{x^3} f(t) d t = x^2 \sin(2 \pi x)$ है,तो $f(8)$ का मान ज्ञात कीजिए।

  • A
    $\frac{2 \pi}{3}$
  • B
    $\frac{4 \pi}{3}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{12}$

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