$\int e^x \cdot \cos 2x \, dx = $ . . . . . . $+ C$.

  • A
    $\frac{e^x}{5}(\cos 2x - 2 \sin 2x)$
  • B
    $\frac{e^x}{\sqrt{5}}(\cos 2x + 2 \sin 2x)$
  • C
    $\frac{e^x}{\sqrt{5}}(\cos 2x - 2 \sin 2x)$
  • D
    $\frac{e^x}{5}(\cos 2x + 2 \sin 2x)$

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