Answer
$ \cos^{2}\theta -3\cos\theta -10$
Work Step by Step
Given expression is-
$ (\cos\theta+2) (\cos\theta-5)$
= $ \cos^{2}\theta -5\cos\theta +2\cos\theta -10$
( By FOIL method)
= $ \cos^{2}\theta -3\cos\theta -10$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 1 - Section 1.5 - More on Identities - 1.5 Problem Set - Page 46: 46
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