यदि $\int {e^x \sin x \, dx} = \frac{1}{2} e^x \cdot a + c$ है,तो $a = $

  • A
    $\sin x - \cos x$
  • B
    $\cos x - \sin x$
  • C
    $-\cos x - \sin x$
  • D
    $\cos x + \sin x$

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