$\int \frac{1}{\log a} (a^x \cos a^x) \, dx = $

  • A
    $\sin a^x + c$
  • B
    $a^x \sin a^x + c$
  • C
    $\frac{1}{(\log a)^2} \sin a^x + c$
  • D
    $\log \sin a^x + c$

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