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Home > PC > Chapter 6 > Lesson 6.3.1 > Problem 6-115

6-115.
  1. Rewrite each of the following series using summation notation. Homework Help ✎

    1. cos(1.2) + cos(1.5) + cos(1.8) + … + cos(3.9)

    2. 1 − 3 + 5 − 7 + 9 − 11 + … + 201

What expression would change the sign back and forth (+ to −)?

(−1)n
n is an integer.

What expression gives odd numbers?

2n + 1