If $(2 + \sin x) \frac{dy}{dx} + (y + 1) \cos x = 0$ and $y(0) = 1$,then $y(\frac{\pi}{2}) = \dots$

  • A
    $\frac{4}{3}$
  • B
    $\frac{1}{3}$
  • C
    $-\frac{2}{3}$
  • D
    $-\frac{1}{3}$

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