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:

Internal Control

Procedures and practices implemented by a company to safeguard its assets, ensure accurate financial reports, and ensure compliance with laws and regulations.

Cash Disbursements

The outflow of cash for expenses, investments, and other payments during a given period.

Internal Control

Processes designed to provide reasonable assurance regarding the achievement of various objectives such as the effectiveness and efficiency of operations.

Documentation Procedures

The processes and methods for systematically recording and organizing documents and records pertinent to business operations.