Question
Let \( \theta \) be an angle in standard position. Name the quadrant in which \( \theta \) lies. \[ \begin{array}{l}\tan \theta>0, \sin \theta<0 \\ \text { The angle } \theta \text { lies in which quadrant? } \\ \text { in } \\ \text { in }\end{array} \]
Ask by Pope Barber. in the United States
Dec 03,2024
Upstudy AI Solution
Tutor-Verified Answer
Answer
The angle \( \theta \) lies in the third quadrant.
Solution
To determine the quadrant in which the angle \( \theta \) lies, we can analyze the given conditions:
1. \( \tan \theta > 0 \): The tangent function is positive in the first and third quadrants.
2. \( \sin \theta < 0 \): The sine function is negative in the third and fourth quadrants.
Now, we need to find the quadrant where both conditions are satisfied simultaneously.
- The first quadrant has \( \tan \theta > 0 \) and \( \sin \theta > 0 \) (not applicable here).
- The second quadrant has \( \tan \theta < 0 \) and \( \sin \theta > 0 \) (not applicable here).
- The third quadrant has \( \tan \theta > 0 \) and \( \sin \theta < 0 \) (this satisfies both conditions).
- The fourth quadrant has \( \tan \theta < 0 \) and \( \sin \theta < 0 \) (not applicable here).
Since the only quadrant that satisfies both conditions is the third quadrant, we conclude that:
\[
\text{The angle } \theta \text{ lies in the third quadrant.}
\]
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Beyond the Answer
The conditions given are that \(\tan \theta > 0\) and \(\sin \theta < 0\). The tangent function is positive in the first and third quadrants, while the sine function is negative in the third and fourth quadrants. The only quadrant that satisfies both conditions is the third quadrant. So, the angle \(\theta\) lies in the third quadrant.