Khan Academy Static

The_unit_circle_definition_of_sine_cosine_and_tangent

Learn how the trigonometric ratios are extended to all real numbers using algebra. Start solving simple problems that involve this new definition of the trigonometric functions.

Trigonometry_with_right_triangles

Learn the basics of trigonometry: What are sine, cosine, and tangent? How can we use them to solve for unknown sides and angles in right triangles?

Graphs_of_trigonometric_functions

Learn how to graph trigonometric functions and how to interpret those graphs. Learn how to construct trigonometric functions from their graphs or other features.

Trigonometric_equations_and_identities

Learn how to solve trigonometric equations and how to use trigonometric identities to solve various problems.

Trigonometry_with_general_triangles

Learn how to use trigonometry in order to find missing sides and angles in any triangle.