Find the Exact Value Under the Given Conditions Find $\cos ( \alpha + \beta )$

question 9

Multiple Choice

Find the exact value under the given conditions.
- $\sin \alpha = - \frac { 24 } { 25 } , \pi < \alpha < \frac { 3 \pi } { 2 } ; \quad \tan \beta = - \frac { 2 \sqrt { 21 } } { 21 } , \frac { \pi } { 2 } < \beta < \pi \quad$ Find $\cos ( \alpha + \beta )$ .

• A) \(\frac { 48 - 7 \sqrt { 21 } } { 125 }\)
• B) \(\frac { 48 + 7 \sqrt { 21 } } { 125 }\)
• C) \(\frac { 14 - 24 \sqrt { 21 } } { 125 }\)
• D) \(\frac { - 14 - 24 \sqrt { 21 } } { 125 }\)

Recognize the effects and limitations of using punishment as a behavioral modification strategy.

Identify the role of discriminative stimuli in learning and behavior modification.

Comprehend the types and effects of reinforcement schedules on behavior.

Understand the implications of conditioning on fear and behavior suppression.

---

Definitions:

Heart Wall

The heart wall is the muscular structure that composes the heart, consisting of three layers: the epicardium, the myocardium, and the endocardium.

Mediastinum

An anatomical region in the thorax that separates the lungs and contains the heart, esophagus, trachea, and other structures.

Base

Molecule that is a proton acceptor; any substance that binds to hydrogen ions. Lower part or bottom of a structure; the base of the heart is the flat portion directed posteriorly and superiorly; veins and arteries project into and out of the base, respectively.

Inferior Aspect

The lower part or section of an anatomical structure or body part.