11a1 tuần 4

$\frac{13\pi}{4}$

$585\degree$

$\frac{15\pi}{4}$

$\frac{-13\pi}{4}$

$60\degree$

$-60\degree$

$60\degree+k180\degree$

$-60\degree+k360\degree$

$\frac{k}{2}\pi$

$\frac{\pi}{2}+k\pi$

$\frac{\pi}{2}+k2\pi$

$\pi+k2\pi$

$$15^0$$

$$20^0$$

$$10^0$$

$$18^0$$

$$\frac{4}{5}$$

$$-\frac{4}{5}$$

$$\frac{16}{25}$$

$$-\frac{16}{25}$$

$$\frac{7\pi}{2}$$

$$\frac{7\pi}{4}$$

$$\frac{2\pi}{7}$$

$$\frac{4\pi}{7}$$

$$600^0$$

$$300^0$$

$$200^0$$  

$$400^0$$  

$$\cos\left(a-b\right)=\cos a.\sin b+\sin a.\cos b$$

$$\sin\left(a-b\right)=\sin a.\cos b-\cos a.\sin b$$

$$\sin\left(a+b\right)=\sin a.\cos b-\cos a.\sin b$$

$$\cos\left(a+b\right)=\cos a.\cos b+\sin a.\sin b$$