### Home > CALC > Chapter Ch3 > Lesson 3.2.2 > Problem 3-67

3-67.

Expand the following trig expressions. Homework Help ✎

sin(

*x*+*y*)cos(

*x*+*y*)sin(

*x*−*y*)cos(

*x*−*y*)

3-67.

Expand the following trig expressions. Homework Help ✎

sin(

*x*+*y*)cos(

*x*+*y*)sin(

*x*−*y*)cos(

*x*−*y*)