Evaluate Without Using a Calculator by Using Ratios in a Reference

question 250

Multiple Choice

Evaluate without using a calculator by using ratios in a reference triangle.
- $\cos 210 ^ { \circ }$

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

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Definitions:

Gate Control Theory

A theory suggesting that psychological factors play a role in the perception of pain, proposing that pain signals pass through neural "gates" in the spinal cord that can modulate pain intensity.

Pain Sensations

The feelings or perceptions produced by stimulation of nerve endings, often signaling harm or potential injury.

Neural Gate

A theoretical mechanism within the nervous system thought to control the passage of pain signals to the brain.

Signal Inhibition

A process by which neural activity is reduced or stopped, leading to the decrease or cessation of a physiological response or signal transmission.