If \(\tan \phi<0\) and \(\sin \phi>0\), state the quadrant in which \(\phi\) lies.

Short Answer

Expert verified
Answer: Quadrant II

Step by step solution

01

Understanding the signs of trigonometric functions

Recall that in the coordinate plane, any angle can be represented in terms of its position relative to the four quadrants: - Quadrant I: All angles between \(0\) and \(90\) degrees (0 and \(\frac{\pi}{2}\) radians) - Quadrant II: All angles between \(90\) and \(180\) degrees (\(\frac{\pi}{2}\) and \(\pi\) radians) - Quadrant III: All angles between \(180\) and \(270\) degrees (\(\pi\) and \(\frac{3\pi}{2}\) radians) - Quadrant IV: All angles between \(270\) and \(360\) degrees (\(\frac{3\pi}{2}\) and \(2\pi\) radians) Trigonometric functions have specific signs depending on which quadrant they are: | Quadrant | sin | cos | tan | | ---------- | ----------- | ----------- | ----------- | | I | Positive | Positive | Positive | | II | Positive | Negative | Negative | | III | Negative | Negative | Positive | | IV | Negative | Positive | Negative | We are given that \(\tan \phi<0\) (Negative) and \(\sin \phi>0\) (Positive).
02

Identifying the quadrant

From the table above, we can see that the only quadrant where \(\tan \phi\) is negative and \(\sin \phi\) is positive is Quadrant II. Thus, the angle \(\phi\) lies in Quadrant II.

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