Use a Calculator to Evaluate the Function $\cos \left( \frac { \pi } { 9 } \right)$

question 157

Multiple Choice

Use a calculator to evaluate the function. Round your answer to 4 decimal places.
- $\cos \left( \frac { \pi } { 9 } \right)$

• A) \(0.9999\)
• B) \(0.3420\)
• C) \(0.4083\)
• D) \(0.9397\)

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Definitions:

Interest Rate on Savings

The percentage yield paid by financial institutions to deposit account holders on the balances in their savings accounts.

Substitution Effect

The change in consumption patterns due to a change in the relative prices of goods, leading consumers to substitute one product for another.

Income Effect

Economic principle that describes how a change in an individual's income affects their purchasing behavior.

Interest Rate

The percentage charged on a loan or paid on savings over a certain period of time, essentially the cost of borrowing money or the reward for saving.