Дописать формулы:\ $$\sin^2 \alpha =$$\ $$\frac{1}{\cos^2 \alpha} =$$\ $$\cos (\alpha-\beta)=$$\ $$\sin 2a =$$\ $$\sin a + \sin b =$$\ $$\sin 60^\circ =$$\ $$\cos 45^\circ =$$

Допишем формулы:

$$\sin^2 \alpha = 1 - \cos^2 \alpha$$

$$\frac{1}{\cos^2 \alpha} = \tan^2 \alpha + 1$$

$$\cos (\alpha-\beta) = \cos\alpha \cos\beta + \sin\alpha \sin\beta$$

$$\sin 2a = 2\sin a \cos a$$

$$\sin a + \sin b = 2 \sin \frac{a+b}{2} \cos \frac{a-b}{2}$$

$$\sin 60^\circ = \frac{\sqrt{3}}{2}$$

$$\cos 45^\circ = \frac{\sqrt{2}}{2}$$