$\cos^2 \left( \frac{\pi}{4} - \beta \right) - \sin^2 \left( \alpha - \frac{\pi}{4} \right) = $

  • A
    $\sin(\alpha + \beta)\sin(\alpha - \beta)$
  • B
    $\cos(\alpha + \beta)\cos(\alpha - \beta)$
  • C
    $\sin(\alpha - \beta)\cos(\alpha + \beta)$
  • D
    $\sin(\alpha + \beta)\cos(\alpha - \beta)$

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