Find the Exact Value of the Expression $\frac { 1 } { 2 }$

question 99

Multiple Choice

Find the exact value of the expression.
-cos 45°

• A) \(\frac { 1 } { 2 }\)
• B) \(\sqrt { 2 }\)
• C) \(\frac { \sqrt { 3 } } { 2 }\)
• D) \(\frac { \sqrt { 2 } } { 2 }\)

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Definitions:

Orbicularis Oculi

A circular muscle around the orbit of the eye that allows the eyes to close, blink, and squint.

Masseter

The masseter muscle is a facial muscle that plays a key role in mastication (chewing) by elevating the mandible (lower jaw).

Zygomaticus Major

A muscle of facial expression that draws the angle of the mouth superiorly and posteriorly.

Orbicularis Oris

A circular muscle around the mouth that controls the movements of the mouth and lips.