If X = 3 Cot θ,Use Trigonometric Substitution to Write $\sqrt { 9 + x ^ { 2 } }$

question 55

Multiple Choice

If x = 3 cot θ,use trigonometric substitution to write $\sqrt { 9 + x ^ { 2 } }$ as a trigonometric function of θ,where $0 < \theta < \pi$ . ​

• A)​3 sec θ
• B)​3 csc θ
• C)​3 cos θ
• D)​3 sin θ
• E)​3 cot θ

---

Definitions:

Construct Validity

The degree to which a test or instrument measures the theoretical construct it is intended to measure.

Correlate

To possess a reciprocal relationship or link, where one element influences or relies upon another.

Measures

Tools or instruments used to quantify or categorize variables, typically for the purpose of research or assessment.

Test Validity

The degree to which a test accurately measures what it intends to measure.