જો $I_n=\int(\cos ^n x+\sin ^n x) d x$ અને $I_n-\frac{n-1}{n} I_{n-2}=\frac{\sin x \cos x}{n} f(x)$ હોય,તો $f(x)=$

  • A
    $\cos ^{n-2} x+\sin ^{n-2} x$
  • B
    $\cos ^{n-2} x-\sin ^{n-2} x$
  • C
    $\frac{\cos ^{n-2} x-\sin ^{n-2} x}{n}$
  • D
    $\frac{\cos ^{n-2} x+\sin ^{n-2} x}{n}$

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