Find the Exact Value Without Using a Calculator $\cos \left( \frac { 2 \pi } { 3 } \right)$

question 5

Multiple Choice

Find the exact value without using a calculator.
- $\cos \left( \frac { 2 \pi } { 3 } \right)$

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

---

Definitions:

Discount Rate

The interest rate used in discounted cash flow analysis to determine the present value of future cash flows or the rate charged by central banks on loans to commercial banks.

Lump Sum

A single payment made at a particular time, as opposed to multiple payments made over time.

Insurance Settlement

The payment made by an insurance company to fulfill its obligation under an insurance policy.

Discount Rate

The interest rate charged to commercial banks and other depository institutions on loans received from the country's central bank's discount window.