$0 \le x \le 2\pi$ માટે વિધેય $f(x) = \cos^4 x + \sin^4 x$ નું વિકલિત ધન છે:

  • A
    $0 < x < \frac{\pi}{4}$
  • B
    $\frac{\pi}{4} < x < \frac{\pi}{2}$
  • C
    $\frac{\pi}{2} < x < \frac{3\pi}{4}$
  • D
    $\frac{3\pi}{4} < x < \pi$

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