Domain range
2 6
5 7
6 9
6 10

is this a function?

No it's not.

There is no function that can produce this domain.

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.