Use the Formula for the Cosine of the Difference of Two

question 168

Multiple Choice

Use the Formula for the Cosine of the Difference of Two Angles
- $\cos \left( 165 ^ { \circ } \right) \cos \left( 45 ^ { \circ } \right) + \sin \left( 165 ^ { \circ } \right) \sin \left( 45 ^ { \circ } \right)$

• A) \(\alpha = 165 ^ { \circ } , \beta = 45 ^ { \circ }\)
• B) \(\alpha = - 165 ^ { \circ } , \beta = 45 ^ { \circ }\)
• C) \(\alpha = - 45 ^ { \circ } , \beta = 165 ^ { \circ }\)
• D) \(\alpha = 45 ^ { \circ } , \beta = 165 ^ { \circ }\)

---

Definitions:

Scores

Numerical values that represent the result of an evaluation or measurement.

Z Score

A statistical measure that describes a value's relationship to the mean of a group of values, expressed in units of standard deviation.

Standard Deviation

A measure of the amount of variation or dispersion in a set of values, indicating how much individual data points deviate from the mean.

Mean

The average of a set of numbers calculated by adding them together and dividing by the count of numbers.