$\int_0^1 x(1-x)^n dx =$

  • A
    $\frac{n+3}{(n+1)(n+2)}$
  • B
    $\frac{1}{(n+1)(n+2)}$
  • C
    $\frac{2n+3}{(n+1)(n+2)}$
  • D
    $\frac{4}{(n+1)(n+2)}$

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Difficult
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$\int_{\frac{-\pi}{2}}^{\frac{\pi}{2}} \frac{\cos x}{1+e^x} d x=$

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