2. Преобразование углов. Вычислите: 1) \(\sin(90^\circ+30^\circ)\); 2) \(\cos(90^\circ+30^\circ)\).

1. \(\sin(90^\circ+30^\circ)=\sin120^\circ=\sin60^\circ=\frac{\sqrt3}{2}\).
2. \(\cos(90^\circ+30^\circ)=\cos120^\circ=-\cos60^\circ=-\frac12\).

Ответ: 1) \(\frac{\sqrt3}{2}\); 2) \(-\frac12\).