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Упрости выражения:

1. \({\cfrac{\cos (270\degree + \beta)}{\cos (180\degree - \beta)\ctg (90\degree + \beta)}\mathrlap{+}}\) \( {+ \tg 315\degree}\) ;

2. \({\cfrac{\sin (270\degree + \alpha)}{\sin (180\degree - \alpha)\tg (90\degree + \alpha)}\mathrlap{+}}\) \({+ \ctg 315\degree}\) .

Ответ:

1. [ ];

2. [ ].