Find the Exact Circular Function Value $$\cos \frac { - 2 \pi } { 3 }$$

question 226

Multiple Choice

Find the exact circular function value.
- $$\cos \frac { - 2 \pi } { 3 }$$

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

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Definitions:

Aortic Arch Reflex

A cardiovascular reflex that helps regulate blood pressure by sensing changes in the arterial blood pressure through baroreceptors in the aortic arch.

Parasympathetic Stimulation

Activation of the parasympathetic nervous system, leading to responses like decreased heart rate and increased digestive activity.

Vasoconstriction

The narrowing of blood vessels, which increases blood pressure by decreasing the diameter through which blood can flow.

Vasomotor Sympathetic

Pertaining to the control of blood vessel diameter by the sympathetic nervous system, affecting blood flow and pressure.