$\cos\left(120\degree\right)=\cos\left(60\degree\right)$

 $\cos\left(120\degree\right)=\sin\left(30\degree\right)$ 

$\sin\frac{11\pi}{4}=\frac{1}{2}$

$\cos\frac{\pi}{4}\ =\ \cos\frac{3\pi}{4}$

 $\left(1-\cos^2A\right)\csc^2A=1$ 

 $\left\{60\degree,120\degree,240\degree,300\degree\right\}$  

 $\left\{45\degree,135\degree,225\degree,330\degree\right\}$  

 $\left\{30\degree,60\degree,120\degree,150\degree\right\}$  

 $\left\{45\degree,135\degree,240\degree,335\degree\right\}$  

 $\left\{0\degree,90\degree,180\degree,270\degree\right\}$  

 $1$  

 $2-\sqrt{3}$  

 $\sqrt{3}$  

 $\frac{-\sqrt{3}}{2}$  

 $\frac{1}{2}$  

 $1$  

 $\sqrt{3}$  

 $-1$  

 $\sqrt{2}$  

 $-5$  

5

9

6

7

8

 $\frac{\sqrt{2}-\sqrt{6}}{12}$  

 $\frac{\sqrt{5}+\sqrt{2}}{3}$  

 $\frac{\sqrt{2}+\sqrt{6}}{4}$  

 $\sqrt{2}+\sqrt{3}$  

 $1$  

 $\sin\left(90-\theta\right)=\cos\theta$  

 $\cot\left(270-\theta\right)=\tan\theta$  

 $\cos\left(180+\theta\right)=-\cos\theta$  

 $\csc\left(360-\theta\right)=-\csc\theta$  

 $\sec\left(270+\theta\right)=-\csc\theta$  

$\csc^2\beta+\sin\beta=1$

$\cos\beta\tan\beta=\cot\beta$

$\tan^2\theta\left(1-\sin^2\theta\right)=\cos^2\theta$

$\cot\alpha\sec\alpha=\sec\alpha$

$\left(1-\sin^2\alpha\right)\sec^2\alpha=1$

-0.6923

-0.6383

-0.6361

-0.8292

1.2059