Find the Exact Value by Using a Half-Angle Identity $\cos \frac { 5 \pi } { 12 }$

question 94

Multiple Choice

Find the exact value by using a half-angle identity.
- $\cos \frac { 5 \pi } { 12 }$

• A) \(- \frac { 1 } { 2 } \sqrt { 2 + \sqrt { 3 } }\)
• B) \(\frac { 1 } { 2 } \sqrt { 2 + \sqrt { 3 } }\)
• C) \(\frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }\)
• D) \(- \frac { 1 } { 2 } \sqrt { 2 - \sqrt { 3 } }\)

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Definitions:

Bank Checking Account

A bank account that allows individuals and businesses to deposit money and withdraw funds, which can be accessed using checks, automated teller machines (ATMs), and electronic debits.

Cash Equivalents

Highly liquid investments that are usually reported with cash on the balance sheet.

Petty Cash Receipts

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Petty Cash Account

A small amount of cash on hand used for paying expenses too small to merit writing a check.