Solve the Equation (X in Radians and in Degrees) for All

question 41

Multiple Choice

Solve the equation (x in radians and in degrees) for all exact solutions where appropriate. Round approximate answers
in radians to four decimal places and approximate answers in degrees to the nearest tenth.
- $$\cos ^ { 2 } x + 2 \cos x = - 1$$

• A) \(\{ \pi + 2 n \pi \}\)
• B) \(\{ 2 n \pi \}\)
• C) \(\left\{ \frac { \pi } { 2 } + n \pi , 2 n \pi \right\}\)
• D) \(\{ n \pi \}\)

---

Definitions:

U.S. Treasury Bonds

Long-term government debt securities issued by the United States Department of the Treasury with maturities greater than 10 years.

Managed Mutual Fund

A type of investment fund that is professionally managed, where investors pool their money to be invested in a diversified portfolio of securities.

Retirement

The period of one's life after deciding to permanently leave the workforce behind, often associated with reaching a certain age or financial security.

College Graduate

An individual who has successfully completed a course of study at a college or university and has been awarded a diploma or degree.