Verify the identity. (tan e + cot e)? - sec?e + csc?e + csc*

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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**Verify the Identity**

Given the trigonometric identity:

\[ ( \tan \theta + \cot \theta )^2 =  \sec^2 \theta + \csc^2 \theta \]

To verify this identity, we will manipulate both sides of the equation and show that they are indeed equal. 

**Left-Hand Side (LHS) Manipulation:**

\[ ( \tan \theta + \cot \theta )^2 \]

Expand the squared term:

\[ = \tan^2 \theta + 2 \tan \theta \cot \theta + \cot^2 \theta \]

Since \( \cot \theta = \frac{1}{\tan \theta} \), substitute \( \cot \theta \) in the expression:

\[ = \tan^2 \theta + 2 \tan \theta \cdot \frac{1}{\tan \theta} + \left( \frac{1}{\tan \theta} \right)^2 \]

\[ = \tan^2 \theta + 2 + \frac{1}{\tan^2 \theta} \]

\[ = \tan^2 \theta + 2 + \cot^2 \theta \]

**Right-Hand Side (RHS) Manipulation:**

\[  \sec^2 \theta + \csc^2 \theta \]

We know the basic trigonometric identities:

\[ \sec^2 \theta = 1 + \tan^2 \theta \]

\[ \csc^2 \theta = 1 + \cot^2 \theta \]

Substitute \( \sec^2 \theta \) and \( \csc^2 \theta \) in the expression:

\[ 1 + \tan^2 \theta + 1 + \cot^2 \theta \] 

\[ = \tan^2 \theta + \cot^2 \theta + 2 \]

**Conclusion:**

Both the LHS and the RHS simplify to the same expression:

\[ \tan^2 \theta + cot^2 \theta + 2 \]

Hence, the trigonometric identity is verified:

\[ ( \tan \theta + \cot \theta )^2 = \sec^2 \theta + \csc^2 \theta \]
Transcribed Image Text:**Verify the Identity** Given the trigonometric identity: \[ ( \tan \theta + \cot \theta )^2 = \sec^2 \theta + \csc^2 \theta \] To verify this identity, we will manipulate both sides of the equation and show that they are indeed equal. **Left-Hand Side (LHS) Manipulation:** \[ ( \tan \theta + \cot \theta )^2 \] Expand the squared term: \[ = \tan^2 \theta + 2 \tan \theta \cot \theta + \cot^2 \theta \] Since \( \cot \theta = \frac{1}{\tan \theta} \), substitute \( \cot \theta \) in the expression: \[ = \tan^2 \theta + 2 \tan \theta \cdot \frac{1}{\tan \theta} + \left( \frac{1}{\tan \theta} \right)^2 \] \[ = \tan^2 \theta + 2 + \frac{1}{\tan^2 \theta} \] \[ = \tan^2 \theta + 2 + \cot^2 \theta \] **Right-Hand Side (RHS) Manipulation:** \[ \sec^2 \theta + \csc^2 \theta \] We know the basic trigonometric identities: \[ \sec^2 \theta = 1 + \tan^2 \theta \] \[ \csc^2 \theta = 1 + \cot^2 \theta \] Substitute \( \sec^2 \theta \) and \( \csc^2 \theta \) in the expression: \[ 1 + \tan^2 \theta + 1 + \cot^2 \theta \] \[ = \tan^2 \theta + \cot^2 \theta + 2 \] **Conclusion:** Both the LHS and the RHS simplify to the same expression: \[ \tan^2 \theta + cot^2 \theta + 2 \] Hence, the trigonometric identity is verified: \[ ( \tan \theta + \cot \theta )^2 = \sec^2 \theta + \csc^2 \theta \]
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