Выполни задание

Запиши в виде произведения:

а) \(\sin130\degree + \sin10\degree = \) [ ];

б) \(\sin130\degree - \sin10\degree = \) [ ];

в) \(\cos130\degree + \cos10\degree = \) [ ];

г) \(\cos130\degree - \cos10\degree = \) [ ].