### Home > PC > Chapter 4 > Lesson 4.2.1 > Problem 4-78

4-78.

Write each of the following expressions using sigma notation. Homework Help ✎

cos(2) + 2 cos(4) + 3 cos(6) + … + 15 cos(30)

Use the same thinking process as (a) and (b) above.

4-78.

Write each of the following expressions using sigma notation. Homework Help ✎

cos(2) + 2 cos(4) + 3 cos(6) + … + 15 cos(30)

Use the same thinking process as (a) and (b) above.