RUMUS JUMLAH DAN HASIL KALI TRIGONOMETRI

 $2\ \sin\ 60\degree\ \sin\ 20\degree\ =\ ......$  

•  $\cos\ 40\degree$  

•  $\cos\ 80\degree-\cos\ 40\degree$  

•  $\cos\ 0\degree$  

•  $\cos\ 40\degree\ -\ \cos\ 80\degree$  

• 1

 $\sin\ 7a\degree\ -\ \sin\ 3a\degree=....$  

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

•  $\sin\ 2a\degree$  

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

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

• 1

 $2\ \sin\ \left(\frac{5}{4}\pi+a\right)\cos\left(\frac{1}{4}\pi+a\right)=....$  

•  $\cos\ 2a$  

•  $-\cos\ 2a$  

•  $-\sin\ 2a$  

•  $2\ \sin\ a\ \cos\ a$  

•  $\cos^2a\degree-\sin^2a\degree$  

 $2\ \sin\ \frac{1}{2}\left(a+b\right)\cos\ \frac{1}{2}\left(a-b\right)=.....$  

•  $\sin\ a\degree$  

•  $\sin\ 2a\degree$  

•  $\sin a\degree\ +\ \sin\ b\degree$  

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

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

 $2\ \sin\ 52,5\degree\ \cos\ 7,5\degree\ =\ ....$  

•  $\frac{1}{2}$  

•  $\frac{1}{2}\sqrt{3}$  

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

•  $\left(\sqrt{3}+\sqrt{2}\right)$  

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

 $\cos\ 75\degree-\ \cos\ 15\degree=....$  

• 1

•  $\frac{1}{2}\sqrt{2}$  

•  $\sqrt{2}$  

•  $-\frac{1}{2}\sqrt{2}$  

•  $-\sqrt{2}$  

 $\cos\ 130\degree+\cos\ 110\degree+\cos\ 10\degree=....$  

•  $1$  

•  $\cos\ 130\degree$  

• 0

• -1

•  $\cos\ 10\degree$  

 $\frac{\sin\ 4a\degree\ +\ \sin\ 2a\degree}{\cos\ 4a\degree\ +\ \cos\ 2a\degree}=....$  

•  $\tan\ a\degree$  

•  $\tan\ 3a\degree$  

•  $\sin\ 2a\degree$  

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

• 1

 $\frac{\cos\ 3x\ -\ \cos\ 5x}{\sin\ 3x\ -\ \sin\ x}=.....$  

•  $\sin\ 2x\degree$  

•  $2\ \sin\ x\degree$  

•  $2\ \sin\ a\degree$  

•  $\sin\ 2a\degree$  

•  $2\ \sin\ 2x\degree$  

 $Himpunan\ penyelesaian\ untuk\ 0\degree\le x\le360\degree\ pada\ persamaan\ \cos\ 2x\degree+\cos\ x\degree=0\ adalah....$  

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

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

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

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

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