### Home > A2C > Chapter 8 > Lesson 8.2.1 > Problem 8-120

8-120.

Should *y* = sin *x* and *y* = cos *x* both be parent graphs, or is one the parent of the other? Give reasons for your decision. Homework Help ✎

Notice that the sine curve could be shifted horizontally to match the cosine curve, or vice-versa.

What is the horizontal shift?