Find the Exact Value $\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }$

question 29

Short Answer

Find the exact value. $\cos ^ { 2 } \frac { \pi } { 8 } - \sin ^ { 2 } \frac { \pi } { 8 }$

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Definitions:

Surface Area

The total area that the surface of an object occupies, relevant in various biological, physical, and chemical phenomena due to its influence on rates of reactions.

Digestion

The biochemical breakdown of food into smaller, absorbable components in the digestive tract.

Oropharynx

The oropharynx is the middle part of the throat (pharynx) that lies behind the mouth, extending from the uvula to the level of the hyoid bone, and includes the back third of the tongue, the soft palate, and the tonsils.

Nasopharynx

The upper part of the throat located behind the nose, forming a passage for airflow from the nasal cavity to the larynx and esophagus.