Table of contents
- 0. Review of College Algebra(290)
- 1. Measuring Angles(327)
- 2. Trigonometric Functions on Right Triangles(206)
- 3. Unit Circle(235)
- 4. Graphing Trigonometric Functions(191)
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations(213)
- 6. Trigonometric Identities and More Equations(334)
- 7. Non-Right Triangles(117)
- 8. Vectors(166)
- 9. Polar Equations(96)
- 10. Parametric Equations(15)
- 11. Graphing Complex Numbers(91)
6. Trigonometric Identities and More Equations
Double Angle Identities
6. Trigonometric Identities and More Equations
Double Angle Identities: Study with Video Lessons, Practice Problems & Examples
31PRACTICE PROBLEM
Determine the exact value of the following expression by writing it as the cosine of a double angle.
cos² 67.5° - sin² 67.5°
Determine the exact value of the following expression by writing it as the cosine of a double angle.
cos² 67.5° - sin² 67.5°