Express the Product as a Sum or Difference $\cos 5 x \cos 8 x$

question 29

Multiple Choice

Express the product as a sum or difference.
- $\cos 5 x \cos 8 x$

• A) \(\frac { 1 } { 2 } ( \cos 3 x + \cos 13 x )\)
• B) \(\frac { 1 } { 2 } ( \cos 13 x - \sin 3 x )\)
• C) \(\frac { 1 } { 2 } ( \cos 13 x - \cos 3 x )\)
• D) \(\cos ^ { 2 } 28 x ^ { 2 }\)

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Definitions:

Southern Texas

A geographic area of Texas in the United States, characterized by its proximity to the Mexican border and distinct cultural, economic, and natural features.

Comanches

are a Native American people historically known for their horse culture and as formidable warriors, primarily located in what is now Texas, Oklahoma, and New Mexico.

Texas Borderland

A region characterized by its geographic location on the border between the United States and Mexico, notable for its unique cultural, social, and economic dynamics.

Tejanos

Texas settlers of Spanish or Mexican descent.