$n > 0$ के लिए,$\int_0^{2\pi } {\frac{{x{{\sin }^{2n}}x}}{{{{\sin }^{2n}}x + {{\cos }^{2n}}x}}\,dx = } $

  • A
    ${\pi ^{ - 1}}$
  • B
    $\pi $
  • C
    ${\pi ^{ - 2}}$
  • D
    ${\pi ^2}$

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