Prove the identity. (1- sin'x)c CSCX= COSX cotx

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Can someone help me prove the identity of the statement? It has to be step by step with the rule included.

### Proving Trigonometric Identities: An Example

#### Example: Verify the identity

\[ (1 - \sin^2 x) \csc x = \cos x \cot x \]

To prove this identity, we will show each step and the rules applied in transforming the left-hand side (LHS) to make it equal to the right-hand side (RHS).

#### Steps:

1. **Rewrite the given identity:**

   \[ (1 - \sin^2 x) \csc x \]

2. **Apply the Pythagorean Identity:**

   Recall that \(\sin^2 x + \cos^2 x = 1\), so:

   \[ 1 - \sin^2 x = \cos^2 x \]

   Substitute this into our equation:

   \[ \cos^2 x \csc x \]

3. **Rewrite \(\csc x\):**

   Remember that \(\csc x = \frac{1}{\sin x}\), so:

   \[ \cos^2 x \cdot \frac{1}{\sin x} \]

4. **Simplify:**

   Separate the terms:

   \[ \cos x \cdot \left(\cos x \cdot \frac{1}{\sin x}\right) \]

   Since \(\frac{\cos x}{\sin x} = \cot x\):

   \[ \cos x \cdot \cot x \]

Thus, we have shown that:

\[ (1 - \sin^2 x) \csc x = \cos x \cot x \]

### Key Points to Remember:
- Use the Pythagorean identity: \(\sin^2 x + \cos^2 x = 1\)
- Remember reciprocal identities: \(\csc x = \frac{1}{\sin x}\)
- Simplify step by step, ensuring to apply algebraic transformations correctly

Ensuring each statement is based on a recognized rule or identity helps in systematically proving trigonometric identities.
Transcribed Image Text:### Proving Trigonometric Identities: An Example #### Example: Verify the identity \[ (1 - \sin^2 x) \csc x = \cos x \cot x \] To prove this identity, we will show each step and the rules applied in transforming the left-hand side (LHS) to make it equal to the right-hand side (RHS). #### Steps: 1. **Rewrite the given identity:** \[ (1 - \sin^2 x) \csc x \] 2. **Apply the Pythagorean Identity:** Recall that \(\sin^2 x + \cos^2 x = 1\), so: \[ 1 - \sin^2 x = \cos^2 x \] Substitute this into our equation: \[ \cos^2 x \csc x \] 3. **Rewrite \(\csc x\):** Remember that \(\csc x = \frac{1}{\sin x}\), so: \[ \cos^2 x \cdot \frac{1}{\sin x} \] 4. **Simplify:** Separate the terms: \[ \cos x \cdot \left(\cos x \cdot \frac{1}{\sin x}\right) \] Since \(\frac{\cos x}{\sin x} = \cot x\): \[ \cos x \cdot \cot x \] Thus, we have shown that: \[ (1 - \sin^2 x) \csc x = \cos x \cot x \] ### Key Points to Remember: - Use the Pythagorean identity: \(\sin^2 x + \cos^2 x = 1\) - Remember reciprocal identities: \(\csc x = \frac{1}{\sin x}\) - Simplify step by step, ensuring to apply algebraic transformations correctly Ensuring each statement is based on a recognized rule or identity helps in systematically proving trigonometric identities.
### Select the Rule

Please choose one of the following mathematical rules to explore:

- **Algebra**
- **Reciprocal**
- **Quotient**
- **Pythagorean**
- **Odd Even** 

Click on the radio button next to the rule you wish to learn more about. Each rule comes with detailed explanations, examples, and exercises to enhance your understanding.
Transcribed Image Text:### Select the Rule Please choose one of the following mathematical rules to explore: - **Algebra** - **Reciprocal** - **Quotient** - **Pythagorean** - **Odd Even** Click on the radio button next to the rule you wish to learn more about. Each rule comes with detailed explanations, examples, and exercises to enhance your understanding.
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