Afunction of the form f(x)=mc+b, where m and b are real numbers is called a function ?

You mean f(x) = my+ b
This is called slope

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.