Calculus: Early Transcendentals
Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
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### Problem Statement

What is the smallest positive solution to \(5\sin^2 x - \cos^2 x = 1\)? Round to 2 decimal places.

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### Explanation

This problem involves solving a trigonometric equation to find the smallest positive solution for \(x\). The equation combines both sine and cosine functions, and solving it typically involves using trigonometric identities and algebraic manipulation.

1. **Trigonometric Identity:** One key identity that might be useful is \(\sin^2 x + \cos^2 x = 1\).

2. **Algebraic Manipulation:** You may try expressing the equation in terms of a single trigonometric function, using the identity mentioned above to simplify \(\cos^2 x\).

3. **Potential Method of Solution:**
   - Substitute \(\cos^2 x\) with \(1 - \sin^2 x\).
   - Solve the resulting quadratic equation in terms of \(\sin x\).
   - Find the smallest positive solution for \(x\).

This exercise is a practice of combining knowledge of trigonometry with algebraic techniques to find a specific numerical solution.
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Transcribed Image Text:### Problem Statement What is the smallest positive solution to \(5\sin^2 x - \cos^2 x = 1\)? Round to 2 decimal places. --- ### Explanation This problem involves solving a trigonometric equation to find the smallest positive solution for \(x\). The equation combines both sine and cosine functions, and solving it typically involves using trigonometric identities and algebraic manipulation. 1. **Trigonometric Identity:** One key identity that might be useful is \(\sin^2 x + \cos^2 x = 1\). 2. **Algebraic Manipulation:** You may try expressing the equation in terms of a single trigonometric function, using the identity mentioned above to simplify \(\cos^2 x\). 3. **Potential Method of Solution:** - Substitute \(\cos^2 x\) with \(1 - \sin^2 x\). - Solve the resulting quadratic equation in terms of \(\sin x\). - Find the smallest positive solution for \(x\). This exercise is a practice of combining knowledge of trigonometry with algebraic techniques to find a specific numerical solution.
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