ધારો કે $f_k(x) = \frac{1}{k}(\sin^k x + \cos^k x)$ જ્યાં $x \in R$ અને $k \ge 1$ છે. તો $f_4(x) - f_6(x)$ ની કિંમત શોધો.

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

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