Table of contents
- 0. Review of College Algebra(0)
- 1. Measuring Angles(0)
- 2. Trigonometric Functions on Right Triangles(0)
- 3. Unit Circle(0)
- 4. Graphing Trigonometric Functions(0)
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations(0)
- 6. Trigonometric Identities and More Equations(0)
- 7. Non-Right Triangles(0)
- 8. Vectors(0)
- 9. Polar Equations(0)
- 10. Parametric Equations(0)
- 11. Graphing Complex Numbers(0)
6. Trigonometric Identities and More Equations
Sum and Difference Identities
6. Trigonometric Identities and More Equations
Sum and Difference Identities: Study with Video Lessons, Practice Problems & Examples
Back to all problems
113PRACTICE PROBLEM
Determine the exact value of the expression cos(x + y), given the following conditions:
cos x = 21/29, x in Quadrant IV
sin y = -1/7, y in Quadrant III
Determine the exact value of the expression cos(x + y), given the following conditions:
cos x = 21/29, x in Quadrant IV
sin y = -1/7, y in Quadrant III