Выполни задание

Запиши в виде произведения:

а) \(\sin70\degree + \sin50\degree = \) [ ];

б) \(\sin70\degree- \sin50\degree = \) [ ];

в) \(\cos70\degree+ \cos50\degree = \) [ ];

г) \(\cos70\degree - \cos50\degree = \) [ ].