Write the Word or Phrase That Best Completes Each Statement $$\cos \left( x + \frac { \pi } { 6 } \right) = \frac { \sqrt { 3 } } { 2 } \cos x - \frac { 1 } { 2 } \sin x$$

question 264

Essay

Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
- $$\cos \left( x + \frac { \pi } { 6 } \right) = \frac { \sqrt { 3 } } { 2 } \cos x - \frac { 1 } { 2 } \sin x$$

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Definitions:

Standard Error

A measure that describes the distribution of sample means around the population mean in a sampling distribution.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values; indicates how much the values in a data set differ from the mean.

Variability

A measure of how much scores in a data set differ from each other and from the mean, indicating the spread or dispersion of the data points.

Sample Means

The arithmetic average of a set of values or measurements taken from a sample of a larger population.