How do you know if a graph you are looking at shows a periodic function?

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?