2. sin 30° = 1/2, cos 30° = ..., tg 30° = √3/3; sin 60° = √3/2, cos 60° = 1/2, tg 60° = ..., ctg 60° = √3; sin 45° = cos 45° = √2/2, tg 45° = ctg 45° = ....

sin 30° = \( \frac{1}{2} \), cos 30° = \( \frac{\sqrt{3}}{2} \), tg 30° = \( \frac{\sqrt{3}}{3} \);
sin 60° = \( \frac{\sqrt{3}}{2} \), cos 60° = \( \frac{1}{2} \), tg 60° = \( \sqrt{3} \), ctg 60° = \( \frac{\sqrt{3}}{3} \);
sin 45° = cos 45° = \( \frac{\sqrt{2}}{2} \), tg 45° = ctg 45° = 1.