मान लीजिए $f_k(x) = \frac{1}{k}(\sin^k x + \cos^k x)$ जहाँ $x \in R$ और $k \ge 1$ है। तो $f_4(x) - f_6(x)$ का मान ज्ञात कीजिए।

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{12}$
  • C
    $\frac{1}{6}$
  • D
    $\frac{1}{3}$

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