### Home > A2C > Chapter 13 > Lesson 13.2.3 > Problem 13-132

13-132.

Consider the function

Make a complete graph of

.Write a simpler trig function that is represented by the same graph.

Which trig function passes through the origin?

Now use the angle sum identity to expand and simplify

. Use Angle Sum Identities.

Does your work in part (c) agree with your graphical results from parts (a) and (b)? Explain.

Your answers should agree.