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Gabriela needs to find the cosine of . If she knows that cos=, how can she use the double angle formula to find cos Show what she would do.

Gabriela needs to find the cosine of . If she knows that cos=, how can she use the double angle formula to find cos Show what she would do.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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3. Gabriela needs to find the cosine of . If she knows that cos" = , how can she use the double angle formula to find cos Show what she would do. 4]
Transcribed Image Text:3. Gabriela needs to find the cosine of . If she knows that cos" = , how can she use the double angle formula to find cos Show what she would do. 4]
Expert Solution
Step 1

It is known that π6 can be written as 2π12.

Formula used:

Here we shall use the formula:

cos2x=2cos2x-1

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