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Find the signs of the six trigonometric function values for the given angle, \( -242^{\circ} \) The trigonometric function value of \( \sin \left(-242^{\circ}\right) \) is positive, \( \cos \left(-242^{\circ}\right) \) is negative, and \( \tan \left(-242^{\circ}\right) \) is negative. The trigonometric function value of \( \csc \left(-242^{\circ}\right) \) is \( \square \sec \left(-242^{\circ}\right) \) is Part 2 of 2

Ask by Peters Riley. in the United States
Feb 03,2025

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Answer

For the angle \( -242^{\circ} \): - \( \sin(-242^{\circ}) \) is positive. - \( \cos(-242^{\circ}) \) is negative. - \( \tan(-242^{\circ}) \) is negative. - \( \csc(-242^{\circ}) \) is positive. - \( \sec(-242^{\circ}) \) is negative. - \( \cot(-242^{\circ}) \) is negative.

Solution

To determine the signs of all six trigonometric functions for the angle \( -242^{\circ} \), let's analyze the angle step by step. ### Step 1: Determine the Equivalent Positive Angle First, find the positive coterminal angle for \( -242^{\circ} \): \[ -242^{\circ} + 360^{\circ} = 118^{\circ} \] So, \( -242^{\circ} \) is coterminal with \( 118^{\circ} \). ### Step 2: Identify the Quadrant The angle \( 118^{\circ} \) lies in the **Second Quadrant** (between \( 90^{\circ} \) and \( 180^{\circ} \)). ### Step 3: Determine the Signs of the Trigonometric Functions in the Second Quadrant | Function | Sign in Second Quadrant | |----------|-------------------------| | \( \sin \) | Positive | | \( \cos \) | Negative | | \( \tan \) | Negative | | \( \csc \) | Positive | | \( \sec \) | Negative | | \( \cot \) | Negative | ### Step 4: Apply to \( -242^{\circ} \) 1. **Sine and Cosecant:** - \( \sin(-242^{\circ}) = \sin(118^{\circ}) \) is **Positive**. - \( \csc(-242^{\circ}) = \csc(118^{\circ}) \) is **Positive**. 2. **Cosine and Secant:** - \( \cos(-242^{\circ}) = \cos(118^{\circ}) \) is **Negative**. - \( \sec(-242^{\circ}) = \sec(118^{\circ}) \) is **Negative**. 3. **Tangent and Cotangent:** - \( \tan(-242^{\circ}) = \tan(118^{\circ}) \) is **Negative**. - \( \cot(-242^{\circ}) = \cot(118^{\circ}) \) is **Negative**. ### Summary of Signs - \( \sin(-242^{\circ}) \) : **Positive** - \( \cos(-242^{\circ}) \) : **Negative** - \( \tan(-242^{\circ}) \) : **Negative** - \( \csc(-242^{\circ}) \) : **Positive** - \( \sec(-242^{\circ}) \) : **Negative** - \( \cot(-242^{\circ}) \) : **Negative** ### Final Answer - **Cosecant:** \( \csc(-242^{\circ}) \) is **positive**. - **Secant:** \( \sec(-242^{\circ}) \) is **negative**.

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Beyond the Answer

To find the signs of the remaining trigonometric functions, we can use the relationships between them and the information given. Since sine is positive, cosecant (the reciprocal of sine) will also be positive. For cosine, we know it’s negative, and therefore, secant (the reciprocal of cosine) will also be negative. This means: - \( \csc\left(-242^\circ\right) \) is positive - \( \sec\left(-242^\circ\right) \) is negative So, putting this all together, the signs of the six trigonometric functions for the angle \( -242^{\circ} \) are: - \( \sin(-242^\circ) > 0 \) - \( \cos(-242^\circ) < 0 \) - \( \tan(-242^\circ) < 0 \) - \( \csc(-242^\circ) > 0 \) - \( \sec(-242^\circ) < 0 \) - \( \cot(-242^\circ) > 0 \) (since cotangent is the ratio of cosine to sine, it takes the sign of sine which is positive when sine is positive)

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