मान लीजिए $f_n = \int_0^{\frac{\pi}{2}} \left(\sum_{k=1}^n \sin^{k-1} x\right) \left(\sum_{k=1}^n (2k-1) \sin^{k-1} x\right) \cos x \, dx$,जहाँ $n \in N$ है। तो $f_{21} - f_{20}$ का मान $...........$ है।

  • A
    $40$
  • B
    $41$
  • C
    $42$
  • D
    $43$

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