COS ( 72 - x) cos (-x) = sin (2x) 2

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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Bonnie received a message from the Secret Society of Inventors about a
possible job. They require any response, however, to be written in a special code
requiring a person to prove the following identity. Bonnie hates this type of thing,
so she's making you do it.
Prove the following trigonometric identity in the usual fashion, and write a few
sentences about how each step follows from the previous step (which identities
or properties are being used).

COS
( 27 - x) cos (-x) =
sin (2x)
2
Transcribed Image Text:COS ( 27 - x) cos (-x) = sin (2x) 2
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