CPM Homework Banner
2-41.
  1. Rewrite the following sums using summation notation. Homework Help ✎

    1. 5 + 7 + 9 + 11 + 13

    2. 2 cos 2π + 3 cos 3π + 4 cos 4π + 5 cos 5π

Answers vary. Here are three possible answers.

Notice the index of all answers: every index has exactly 5 terms... because there are exactly 5 terms in the series.

Complete the argument:

Complete the index: