Express the Product as a Sum Containing Only Sines or Cosines

question 10

Multiple Choice

Express the product as a sum containing only sines or cosines.
- $$\cos \frac { 11 \theta } { 2 } \cos \frac { \theta } { 2 }$$

• A) \(\frac { 1 } { 4 } \cos ^ { 2 } ( 5 \theta )\)
• B) \(\frac { 1 } { 4 } [ \cos ( 6 \theta ) - \sin ( 4 \theta ) ]\)
• C) \(\frac { 1 } { 2 } [ \cos ( 2 \theta ) + \cos ( 3 \theta ) ]\)
• D) \(\frac { 1 } { 2 } [ \cos ( 3 \theta ) - \sin ( 2 \theta ) ]\)

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Definitions:

Wages Payable

A liability account that records the amount of wages earned by employees but not yet paid by the company.

Unearned Rent

Income received by a landlord for rent that has been paid in advance, but which covers a period that has not yet occurred, and is recorded as a liability.

Net Income

The total profit of a company after all expenses are deducted from revenues, also known as the bottom line.

Understated

Described or represented as less than is actually the case; downplayed in expression or estimation.