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Three trigonometric functions for a given angle are shown below. \( \csc \theta=\frac{13}{12}, \sec \theta=-\frac{13}{5}, \cot \theta=-\frac{5}{12} \) What are the coordinates of point \( (x, y) \) on the terminal ray of angle \( \theta \), assuming that the values above were not simplified? \( (-5,12) \) \( (5,-12) \) \( (-12,5) \) \( (12,-5) \)

Ask by Coleman Boyd. in the United States
Feb 28,2025

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Answer

The coordinates of point \( (x, y) \) on the terminal ray of angle \( \theta \) are \( (-5, 12) \).

Solution

We start with the definitions of the trigonometric functions in terms of coordinates: • csc θ = r/y • sec θ = r/x • cot θ = x/y Given that csc θ = 13/12, we have   sin θ = 1/(csc θ) = 12/13, which implies that if we let r = 13, then y = 12. Similarly, using sec θ = –13/5:   cos θ = 1/(sec θ) = –5/13, so x = –5. For confirmation, cot θ = x/y = –5/12, which matches the given cot θ = –5/12. Thus, the coordinates on the terminal ray of angle θ are (x, y) = (–5, 12). Among the answer choices, this corresponds to:   (–5, 12).

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The Deep Dive

To find the coordinates \( (x, y) \) for the terminal ray of angle \( \theta \), we can use the definitions of the given trigonometric functions. We know: 1. \( \csc \theta = \frac{1}{\sin \theta} \), which gives us \( \sin \theta = \frac{12}{13} \). 2. \( \sec \theta = \frac{1}{\cos \theta} \), giving us \( \cos \theta = -\frac{5}{13} \). 3. \( \cot \theta = \frac{\cos \theta}{\sin \theta} \), which checks out since \( \cot \theta = -\frac{5}{12} \). Now we can determine the coordinates. Using \( r = 13 \) (the hypotenuse from \( r^2 = x^2 + y^2 \)), we find: - \( y = r \cdot \sin \theta = 13 \cdot \frac{12}{13} = 12 \) - \( x = r \cdot \cos \theta = 13 \cdot -\frac{5}{13} = -5 \) Therefore, the coordinates are \( (-5, 12) \). The answer is: \( (-5,12) \)

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