Use a Product-To-Sum Formula to Convert the Expression to a Sum

question 6

Multiple Choice

Use a product-to-sum formula to convert the expression to a sum or difference. Simplify where possible. $\cos 47 ^ { \circ } \cos 43 ^ { \circ }$

• A) \(\frac { 1 } { 2 } \left( 1 + \sin 4 ^ { \circ } \right)\)
• B) \(\sqrt { 2 } \cos 2 ^ { \circ }\)
• C) \(\frac { 1 } { 2 } \cos 4 ^ { \circ }\)
• D) \(- \frac { 1 } { 2 } \cos 4 ^ { \circ }\)
• E) \(\frac { 1 } { 2 } \left( 1 - \sin 4 ^ { \circ } \right)\)

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Definitions:

Individuals

Single humans, emphasizing the unique characteristics and circumstances of each person.

Abstract Image

An artistic representation that does not attempt to portray an accurate depiction of visual reality, instead using shapes, colors, and textures in a non-literal manner.

Mental Pictures

are the images or visual representations formed in the mind, often used in memory or imaginative processes.

Reality

The state of things as they actually exist, as opposed to an idealistic or notional idea of them.