Search results
Learn how to calculate and use the trigonometric functions sin, cos and tan based on a right triangle. See examples, graphs, animations and exercises to practice and understand these important concepts.
Learn how to find sin, cos, and tan values for any angle using formulas, table, and unit circle. See applications of sin, cos, and tan in real life problems with examples.
Learn the definitions, ratios, ranges and examples of sine, cosine and tangent functions. Test your skills with interactive angles and practice problems on identifying opposite, adjacent and hypotenuse sides.
Learn how to find sin cos tan values for different angles using formulas, table and examples. Sin cos tan values are the trigonometric ratios of opposite side, adjacent side and hypotenuse of a right triangle.
- 85 min
Khan Academy offers a free online course on trigonometry, covering right triangles, the unit circle, graphs, identities, and more. Learn how to use sin, cos, and tan functions and their properties with examples and exercises.
The trigonometric function are periodic functions, and their primitive period is 2 π for the sine and the cosine, and π for the tangent, which is increasing in each open interval (π /2 + k π, π /2 + (k + 1) π).
Learn how to use sin, cos, and tan to relate angles and sides of right triangles. Watch a video, see diagrams, and read comments and questions from other learners.
- 9 min
- Sal Khan
