Question
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For the angle \( \theta \) in standard position, determine the quadrant where the terminal side of \( \theta \) lies. \( \csc \theta>0 \) and \( \tan \theta<0 \) Quadrant:

Ask by Boyd Hobbs. in the United States
Jan 24,2025

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Tutor-Verified Answer

Answer

Quadrant II

Solution

To determine the quadrant in which the terminal side of \( \theta \) lies, given that \( \csc \theta > 0 \) and \( \tan \theta < 0 \), let's analyze each condition: 1. **\( \csc \theta > 0 \)** - \( \csc \theta = \frac{1}{\sin \theta} \) - Therefore, \( \csc \theta > 0 \) implies \( \sin \theta > 0 \). - The sine function is positive in **Quadrants I and II**. 2. **\( \tan \theta < 0 \)** - \( \tan \theta = \frac{\sin \theta}{\cos \theta} \) - \( \tan \theta < 0 \) implies that \( \sin \theta \) and \( \cos \theta \) have **opposite signs**. - This occurs in **Quadrants II and IV**. 3. **Combining both conditions:** - From \( \sin \theta > 0 \), \( \theta \) must be in Quadrant I or II. - From \( \tan \theta < 0 \), \( \theta \) must be in Quadrant II or IV. - The only quadrant that satisfies both conditions is **Quadrant II**. **Answer:** Quadrant II

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Bonus Knowledge

To determine the quadrant where the terminal side of the angle \( \theta \) lies, let's analyze the given conditions. The condition \( \csc \theta > 0 \) indicates that \( \sin \theta \) is also positive because the cosecant function is the reciprocal of the sine function. This occurs when \( \theta \) is in either the first quadrant (where both sine and cosine are positive) or the second quadrant (where sine is positive and cosine is negative). On the other hand, the condition \( \tan \theta < 0 \) tells us that the tangent function is negative. Since tangent is the ratio of sine to cosine (\( \tan \theta = \frac{\sin \theta}{\cos \theta} \)), this situation can only arise in the second quadrant (where sine is positive and cosine is negative). Combining these two conditions tells us that the terminal side of \( \theta \) lies in the second quadrant. Quadrant: II

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