Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.7: Applied Problems
Problem 17E
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Write out the first three terms and the last term (see attachment). Then use the formula for the sum of the first n terms of an arithmetic sequence to find the indicated sum.
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