How can you use the pattern in the table of combinations to find a number in Pascal’s triangle?

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

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Which equation matches the graph shown ?