### Home > CALC > Chapter 3 > Lesson 3.2.2 > Problem3-67

3-67.

Expand the following trig expressions.

1. $\operatorname{sin}(x + y)$

1. $\operatorname{cos}(x + y)$

1. $\operatorname{sin}(x-y)$

1. $\operatorname{cos}(x-y)$