$\int \sqrt{4 \cos ^2 x - 5 \sin ^2 x} \cos x \, dx =$

  • A
    $\frac{1}{2} \cos x \sqrt{4 - 9 \sin ^2 x} + \frac{2}{3} \sin ^{-1}\left(\frac{3 \sin x}{2}\right) + c$
  • B
    $\frac{1}{2} \sin x \sqrt{4 - 9 \sin ^2 x} + \frac{2}{3} \cos ^{-1}\left(\frac{3 \cos x}{2}\right) + c$
  • C
    $\frac{1}{2} \cos x \sqrt{1 - 9 \cos ^2 x} + \frac{2}{3} \sin ^{-1}\left(\frac{3 \cos x}{2}\right) + c$
  • D
    $\frac{1}{2} \sin x \sqrt{4 - 9 \sin ^2 x} + \frac{2}{3} \sin ^{-1}\left(\frac{3 \sin x}{2}\right) + c$

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