मान लीजिए कि $k = 1, 2, 3, ...$ के लिए ${f_k}(x) = \frac{1}{k}(\sin^k x + \cos^k x)$ है। तो सभी $x \in R$ के लिए,$f_4(x) - f_6(x)$ का मान किसके बराबर है?

  • A
    $\frac{1}{12}$
  • B
    $\frac{1}{4}$
  • C
    $-\frac{1}{12}$
  • D
    $\frac{5}{12}$

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