Question
upstudy study bank question image url

Find the exact value of each of the remaining trigonometric functions of \( \theta \). Rationalize denominators when applicable. \( \sec \theta=-5 \), given that \( \sin \theta>0 \) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. \( \sin \theta=\square \) (Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) B. The function is undefined.

Ask by George Hodges. in the United States
Feb 03,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

\( \sin \theta = \dfrac{2\,\sqrt{6}}{5} \)

Solution

Given that \( \sec \theta = -5 \) and \( \sin \theta > 0 \), we can determine the remaining trigonometric functions as follows: 1. **Find \( \cos \theta \):** \[ \sec \theta = \frac{1}{\cos \theta} \implies \cos \theta = \frac{1}{\sec \theta} = \frac{1}{-5} = -\frac{1}{5} \] 2. **Determine \( \sin \theta \):** Since \( \sin^2 \theta + \cos^2 \theta = 1 \), \[ \sin^2 \theta = 1 - \cos^2 \theta = 1 - \left(-\frac{1}{5}\right)^2 = 1 - \frac{1}{25} = \frac{24}{25} \] \[ \sin \theta = \sqrt{\frac{24}{25}} = \frac{\sqrt{24}}{5} = \frac{2\sqrt{6}}{5} \] (We take the positive root because \( \sin \theta > 0 \).) 3. **Other Trigonometric Functions:** \[ \tan \theta = \frac{\sin \theta}{\cos \theta} = \frac{\frac{2\sqrt{6}}{5}}{-\frac{1}{5}} = -2\sqrt{6} \] \[ \csc \theta = \frac{1}{\sin \theta} = \frac{1}{\frac{2\sqrt{6}}{5}} = \frac{5}{2\sqrt{6}} = \frac{5\sqrt{6}}{12} \] \[ \cot \theta = \frac{1}{\tan \theta} = \frac{1}{-2\sqrt{6}} = -\frac{\sqrt{6}}{12} \] **Final Answer:** **A.** \( \sin \theta = \dfrac{2\,\sqrt{6}}{5} \)

Reviewed and approved by the UpStudy tutoring team

error msg
Explain
Simplify this solution

Mind Expander

Since \( \sec \theta = -5 \), we know \( \cos \theta = -\frac{1}{5} \). Now, using the Pythagorean identity \( \sin^2 \theta + \cos^2 \theta = 1 \), we can find \( \sin \theta \). Substituting \( \cos \theta \): \[ \sin^2 \theta + \left(-\frac{1}{5}\right)^2 = 1 \] \[ \sin^2 \theta + \frac{1}{25} = 1 \] \[ \sin^2 \theta = 1 - \frac{1}{25} = \frac{25}{25} - \frac{1}{25} = \frac{24}{25} \] Now, taking the square root: \[ \sin \theta = \sqrt{\frac{24}{25}} = \frac{\sqrt{24}}{5} = \frac{2\sqrt{6}}{5} \] Since we know \( \sin \theta > 0 \), we have: A. \( \sin \theta = \frac{2\sqrt{6}}{5} \) Now, let's find the exact values of the remaining trigonometric functions. 1. **\( \tan \theta = \frac{\sin \theta}{\cos \theta} \)** \[ \tan \theta = \frac{\frac{2\sqrt{6}}{5}}{-\frac{1}{5}} = -2\sqrt{6} \] 2. **\( \csc \theta = \frac{1}{\sin \theta} = \frac{5}{2\sqrt{6}} = \frac{5\sqrt{6}}{12} \) (after rationalizing)** 3. **\( \cot \theta = \frac{1}{\tan \theta} = -\frac{1}{2\sqrt{6}} = -\frac{\sqrt{6}}{12} \) (after rationalizing)** 4. **\( \cos \theta = -\frac{1}{5} \) already stated.** Finally, the values for all the trigonometric functions are: - \( \sin \theta = \frac{2\sqrt{6}}{5} \) - \( \cos \theta = -\frac{1}{5} \) - \( \tan \theta = -2\sqrt{6} \) - \( \csc \theta = \frac{5\sqrt{6}}{12} \) - \( \sec \theta = -5 \) - \( \cot \theta = -\frac{\sqrt{6}}{12} \) So, to complete the answer: A. \( \sin \theta = \frac{2\sqrt{6}}{5} \)

Related Questions

Latest Trigonometry Questions

Try Premium now!
Try Premium and ask Thoth AI unlimited math questions now!
Maybe later Go Premium
Study can be a real struggle
Why not UpStudy it?
Select your plan below
Premium

You can enjoy

Start now
  • Step-by-step explanations
  • 24/7 expert live tutors
  • Unlimited number of questions
  • No interruptions
  • Full access to Answer and Solution
  • Full Access to PDF Chat, UpStudy Chat, Browsing Chat
Basic

Totally free but limited

  • Limited Solution
Welcome to UpStudy!
Please sign in to continue the Thoth AI Chat journey
Continue with Email
Or continue with
By clicking “Sign in”, you agree to our Terms of Use & Privacy Policy