Реши:

1)  \(\cos 40^{\circ} \cdot \cos 10^{\circ} + \sin 40^{\circ} \cdot \sin 10^{\circ}\);

2)  \(\sin 100^\circ \cdot \cos 10^\circ - \cos 100^\circ \cdot \sin 10^\circ\).

• \(1) \,\,\,\,\,\, 0 \,\,\, , \,\,\,\,\,\,\,\, 2) \,\,\,\, 1 \,\)
• \(1) \frac{1}{2} , 2) \frac{1}{2}\)
• \(1) \,\,\,\frac{\sqrt{3}}{2} \,\,\,\,\,\,\,\, 2) \,\,\,\, 1\)
• \(\begin{aligned} 1) \, \, \, \frac{1}{2} \, , \, \, \, \, \, \, \, \, 2) \, \, \, 0 \, \, \end{aligned}\)