Identify cosine function from set of ordered pairs: 

$(0,1),(\frac{\pi}{2}و\ \frac{1}{\sqrt{2}}),(2\pi,-1).$

$Does\ the\ set\ of\ ordered\ pairs\ \left\{(0,2),(\pi,0),(2\pi,2),(3\pi,0)\right\}\exp resses\ a\ \cos ine\ function\ ?$

Identify cosine function from set of ordered pairs: 

$(0,1),(\pi,\frac{1}{2}),(\frac{3\pi}{2},0)$

Identify cosine function from set of ordered pairs: 

$(0,1),(\frac{\pi}{4}و\frac{1}{\sqrt{2}}),(\pi,-1)$

$Does\ the\ set\ of\ ordered\ pairs\ \left\{(-\pi,-2),(-\frac{\pi}{2},0),(0,2),(\frac{\pi}{2},0)\right\}\exp resses\ a\ \cos ine\ function\ ?$

Identify cosine function from set of ordered pairs:

$(0,1),(\frac{\pi}{3},\frac{1}{2}),(\frac{\pi}{2},0).$

$Does\ the\ set\ of\ ordered\ pairs\ (0,1),(\frac{\pi}{2},0),(\pi,-1),(\frac{3\pi}{2},0)\ \exp resses\ a\ \cos ine\ function\ ?$

Identify cosine function from set of ordered pairs: 

$(0,1),(\frac{\pi}{12},\frac{1}{\sqrt{2}}),(\frac{\pi}{3},-1)$

Identify cosine function from set of ordered pairs: $(0,1),(\frac{\pi}{12},\frac{\sqrt{3}}{2}),(\frac{\pi}{8},\frac{1}{\sqrt{2}}).$

Identify cosine function from set of ordered pairs: 

$(0,1),(\frac{\pi}{2},0),(2\pi,1).$