(a)
To show: that there is a polynomial
(a)
Explanation of Solution
Rewrite
Using formula for Cosine,
Using the Pythagorean identify,
Since,
Using formula for cosine,
Using the identity
Simplifying the terms on parentheses, get
Multiplying the terms in parentheses with 2, get
Thus,
(b)
To show: that there is a polynomial
(b)
Explanation of Solution
Rewrite
Using formula for Cosine,
Using a triple angle formula
Using the Pythagorean identity,
In the second term of the second parentheses, get
Combining the like terms, get
Thus,
Chapter 7 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
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