Determine All Solutions of the Equation in Radians $\cos \frac { \theta } { 2 }$

question 187

Multiple Choice

Determine all solutions of the equation in radians.
-Find $\cos \frac { \theta } { 2 }$ , given that $\cos \theta = - \frac { 3 } { 5 }$ and $\theta$ terminates in $90 ^ { \circ } < \theta < 180 ^ { \circ }$ .

• A) \(- \frac { \sqrt { 30 } } { 10 }\)
• B) \(\frac { \sqrt { 5 } } { 5 }\)
• C) \(\frac { \sqrt { 30 } } { 10 }\)
• D) \(- \frac { \sqrt { 5 } } { 5 }\)

---

Definitions:

Arbitrageurs

Traders who attempt to profit by exploiting price differences of identical or similar financial instruments on different markets or in different forms.

Exchange Rate

The price of one currency in terms of another currency for conversion.

Currency

A system of money in general use in a particular country or region, serving as a medium of exchange, unit of account, and store of value.

Arbitrageur

Someone who takes advantage of tiny differences in the exchange rate across markets by simultaneously purchasing a currency in one market and selling it in another market.