Упростите выражение \(\sin{(\pi + \alpha)} + \cos{(\alpha - 2\pi)} - \cos{(\frac{\pi}{2} + \alpha)}\) .

• \(\cos{\alpha}\)
• \(-\cos{\alpha}\)
• \(\cos{\alpha} -2\sin{\alpha}\)
• \(-\cos{\alpha}-2\sin{\alpha}\)