$\int {\left( {\cos \frac{x}{2} - \sin \frac{x}{2}} \right)^2} dx = $

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

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