$2\ \cos\ 5a\degree\ \sin\ 2a\degree$  

 $\sin\ 2a\degree$  

 $2\ \sin\ a\degree\ \cos\ a\degree$  

 $\cos\ 5a\degree\ \sin\ 2a\degree$  

1

 $\cos\ 2a$  

 $-\cos\ 2a$  

 $-\sin\ 2a$  

 $2\ \sin\ a\ \cos\ a$  

 $\cos^2a\degree-\sin^2a\degree$  

 $\sin\ a\degree$  

 $\sin\ 2a\degree$  

 $\sin a\degree\ +\ \sin\ b\degree$  

 $1-2\ \sin\ a\degree\ \cos\ a\degree$  

 $2\ \sin\ a\degree\ \cos\ a\degree$  

 $\frac{1}{2}$  

 $\frac{1}{2}\sqrt{3}$  

 $\frac{1}{2}\left(\sqrt{3}+\sqrt{2}\right)$  

 $\left(\sqrt{3}+\sqrt{2}\right)$  

 $\frac{1}{2}\left(\sqrt{3}-\sqrt{2}\right)$  

1

 $\frac{1}{2}\sqrt{2}$  

 $\sqrt{2}$  

 $-\frac{1}{2}\sqrt{2}$  

 $-\sqrt{2}$  

 $1$  

 $\cos\ 130\degree$  

0

-1

 $\cos\ 10\degree$  

 $\tan\ a\degree$  

 $\tan\ 3a\degree$  

 $\sin\ 2a\degree$  

 $2\ \sin\ a\degree\ \cos\ a\degree$  

1

 $\sin\ 2x\degree$  

 $2\ \sin\ x\degree$  

 $2\ \sin\ a\degree$  

 $\sin\ 2a\degree$  

 $2\ \sin\ 2x\degree$  

 $\left\{60\degree,180\degree,300\degree\right\}$  

 $\left\{0\degree,60\degree,240\degree,300\degree\right\}$  

 $\left\{0\degree,60\degree\right\}$  

 $\left\{60\degree,180\degree,240\degree\right\}$  

 $\left\{180\degree,\ 270\degree,300\degree\right\}$