Find the Exact Value $\cos 85 ^ { \circ } \cos 40 ^ { \circ } + \sin 85 ^ { \circ } \sin 40 ^ { \circ }$

question 3

Multiple Choice

Find the exact value. $\cos 85 ^ { \circ } \cos 40 ^ { \circ } + \sin 85 ^ { \circ } \sin 40 ^ { \circ }$

• A) \(\frac { 3 \sqrt { 2 } } { 2 }\)
• B) \(\frac { \sqrt { 2 } } { 2 }\)
• C) \(1\)
• D) \(- \frac { \sqrt { 3 } } { 2 }\)
• E) none

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Definitions:

Fixed Costs

Costs that do not vary with the volume of production, such as rent, salaries, and insurance.

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Desserts specially made or bought to celebrate a person's birthday, often decorated with icing, candles, and personalized messages.

Average Fixed Cost

The steady expenditure in manufacturing, divided by the total output generated.

Fixed Costs

Costs that do not change with the level of output or sales, such as rent, salaries, and insurance.