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Find the exact value of each of the remaining trigonometric functions of \( \theta \). \[ \cos \theta=-\frac{7}{25} \text {, } \theta \text { in Quadrant II } \] \( \sin \theta=\square \) (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or the expression.)

Ask by Coleman Burns. in the United States
Mar 10,2025

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Answer

\( \sin \theta = \frac{24}{25} \)

Solution

1. We are given that \[ \cos \theta = -\frac{7}{25} \] and that \(\theta\) is in Quadrant II. 2. In Quadrant II, the sine function is positive. Therefore, when finding \(\sin \theta\), we choose the positive square root. 3. We use the Pythagorean identity: \[ \sin^2 \theta + \cos^2 \theta = 1. \] 4. Substitute the given value of \(\cos \theta\): \[ \sin^2 \theta + \left(-\frac{7}{25}\right)^2 = 1. \] 5. Compute the square of \(\cos \theta\): \[ \left(-\frac{7}{25}\right)^2 = \frac{49}{625}. \] 6. Now the equation becomes: \[ \sin^2 \theta + \frac{49}{625} = 1. \] 7. Solve for \(\sin^2 \theta\): \[ \sin^2 \theta = 1 - \frac{49}{625} = \frac{625}{625} - \frac{49}{625} = \frac{576}{625}. \] 8. Take the square root of both sides: \[ \sin \theta = \sqrt{\frac{576}{625}}. \] 9. Simplify the square root: \[ \sqrt{\frac{576}{625}} = \frac{\sqrt{576}}{\sqrt{625}} = \frac{24}{25}. \] 10. Since \(\theta\) is in Quadrant II, we keep the positive root: \[ \sin \theta = \frac{24}{25}. \]

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Beyond the Answer

To find the sine function, we can use the Pythagorean identity, which states that: \[ \sin^2 \theta + \cos^2 \theta = 1 \] Given that \( \cos \theta = -\frac{7}{25} \), we can substitute that into the identity: \[ \sin^2 \theta + \left(-\frac{7}{25}\right)^2 = 1 \] Calculating \( \left(-\frac{7}{25}\right)^2 \): \[ \sin^2 \theta + \frac{49}{625} = 1 \] Next, we subtract \( \frac{49}{625} \) from both sides: \[ \sin^2 \theta = 1 - \frac{49}{625} = \frac{625 - 49}{625} = \frac{576}{625} \] Now, taking the square root of both sides, we have: \[ \sin \theta = \pm \sqrt{\frac{576}{625}} = \pm \frac{\sqrt{576}}{\sqrt{625}} = \pm \frac{24}{25} \] Since we are in Quadrant II, where sine is positive, we choose the positive value: \[ \sin \theta = \frac{24}{25} \] So, the exact value for \( \sin \theta \) is: \[ \sin \theta = \frac{24}{25} \] Now, let's find the remaining trigonometric functions. 1. **Tangent:** We can use the relationship \( \tan \theta = \frac{\sin \theta}{\cos \theta} \): \[ \tan \theta = \frac{\frac{24}{25}}{-\frac{7}{25}} = -\frac{24}{7} \] 2. **Cosecant:** This is the reciprocal of sine: \[ \csc \theta = \frac{1}{\sin \theta} = \frac{25}{24} \] 3. **Secant:** This is the reciprocal of cosine: \[ \sec \theta = \frac{1}{\cos \theta} = -\frac{25}{7} \] 4. **Cotangent:** This is the reciprocal of tangent: \[ \cot \theta = \frac{1}{\tan \theta} = -\frac{7}{24} \] In summary, the values of the trigonometric functions are: - \( \sin \theta = \frac{24}{25} \) - \( \tan \theta = -\frac{24}{7} \) - \( \csc \theta = \frac{25}{24} \) - \( \sec \theta = -\frac{25}{7} \) - \( \cot \theta = -\frac{7}{24} \)

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