Find the Exact Value of Each Expression, If It Is $\cos ^ { - 1 } \left( - \frac { 1 } { 2 } \right)$

question 92

Essay

Find the exact value of each expression, if it is defined.
(a) $\cos ^ { - 1 } \left( - \frac { 1 } { 2 } \right)$
(b) $\sin ^ { - 1 } \left( - \frac { \sqrt { 3 } } { 2 } \right)$
(c) $\tan ^ { - 1 } \left( - \frac { \sqrt { 3 } } { 3 } \right)$

---

Definitions:

Effect Size Formula

A calculation used to describe the strength of the relationship between two variables.

Population Standard Deviation

The standard deviation of the entire population under study, representing the total variability within the population data.

Observed Z Value

A standardized statistic that represents the number of standard deviations a data point is from the mean of a distribution.

Sample Mean

The average value of a sample set of a population, used as an estimate of the population mean.