Ineed . i do not know which one it is

Answer this question only if you know the answer! 30 points and

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)