Ôn tập công thức lượng giác.

$$1$$  

$$\frac{1}{2}$$  

$$\frac{\sqrt{3}}{2}$$  

$$\frac{-\sqrt{3}}{2}$$  

$$\frac{\sqrt{6}+\sqrt{2}}{4}$$  

$$\frac{\sqrt{6}-\sqrt{2}}{4}$$  

$$\frac{\sqrt{2}}{2}$$  

$$\frac{\sqrt{3}}{2}$$  

$$\frac{\pi}{6}$$  

$$\frac{-\pi}{6}$$  

$$\frac{\pi}{3}$$  

$$\frac{-\pi}{3}$$  

- x

$$\frac{\pi}{2}-x$$  

$$\pi-x$$  

$$\pi+x$$  

$$-x$$  

$$\pi-x$$  

$$\frac{\pi}{2}-x$$  

$$\pi+x$$  

x

- 2x

$$\frac{\pi}{2}-x$$

$$\frac{\pi}{2}-2x$$

$$\sin\ x$$  

$$-\sin\ x$$  

$$\cos\ x$$  

$$-\cos x$$  

$$-\sin\ x$$  

$$\sin\ x$$  

$$\cos\ x$$  

$$-\cos x$$  

$$\sin x$$  

$$\cos\ x$$  

$$\tan\ x$$  

$$\cot\ x$$  

$$\cos\ 2x$$  

$$\cos\ \alpha$$  

$$\sin\ \alpha$$  

$$\sin2\alpha$$  

$$-\sin x+\cos x+\tan x$$  

$$\sin x-\cos x+\cot x$$  

$$-\sin x+\cos x+\cot x$$  

$$-\sin x-\cos x+\cot x$$