Trigonometry
Double Angle Formula (Cosine) - Trigonometry
Learn the double angle formula (cosine) with examples, step-by-step guide, and calculator tools. Express cosine of double angle
The double angle formula (cosine) is a fundamental concept in trigonometry. Express cosine of double angle. This page provides a comprehensive guide with worked examples and practical applications.
The Formula
\[\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta)\]
Variables
θ
Angle
Step-by-Step Guide
- 1
Step 1: Gather your data values
- 2
Step 2: Apply the formula
- 3
Step 3: Perform the calculations
- 4
Step 4: Interpret the result
Examples
Example 1
Example 1: [] → cos(60°) = cos²(30°) - sin²(30°) = 0.75 - 0.25 = 0.5
Example 2
Example 2: 0.5
Frequently Asked Questions
What is the double angle formula (cosine)?
Express cosine of double angle
How do I calculate double angle formula (cosine)?
Use the formula: \cos(2\theta) = \cos^2(\theta) - \sin^2(\theta). Follow the steps provided above.
What tools can help with double angle formula (cosine)?
We provide online calculators: calculator