Use the Fundamental Identities to Find the Value of the Trigonometric

question 255

Multiple Choice

Use the fundamental identities to find the value of the trigonometric function.
-Find $\cos \theta$ , given that $\tan \theta = - \frac { 4 } { 9 }$ and $\theta$ is in quadrant II.

• A) \(\frac { 9 \sqrt { 97 } } { 97 }\)
• B) \(- \frac { 9 \sqrt { 97 } } { 97 }\)
• C) \(- \frac { \sqrt { 97 } } { 9 }\)
• D) \(\frac { \sqrt { 97 } } { 4 }\)

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Definitions:

External Validity

The judgment that a research finding can be generalized to other people, in other settings, at other times.

Independent Variable

In an experimental setting, the variable that is manipulated or changed to examine its effect on a dependent variable.

Causal Order

The sequence in which cause and effect events occur, indicating a relationship where one action or event directly influences another.

Experimental Method

A research methodology that involves manipulating one variable to determine if changes in one variable cause changes in another variable.