Khan Academy Static

The_inverse_trigonometric_functions

Learn about the inverse functions of sine, cosine, and tangent, and how they are defined even though the functions are not really invertible. These functions will be very helpful when you will solve trigonometric equations.

Challenging_trigonometry_problems

See Sal solve a bunch of very challenging geometry and algebra problems that involve trigonometry.

Solving_sinusoidal_models

Solve word problems that involve sinusoidal modeling functions.

Solving_basic_sinusoidal_equations

Learn how to solve equations of the form sin(x)=d or cos(x)=d where d is any number. For example, solve sin(x)=0.6.

Solving_advanced_sinusoidal_equations

Learn how to solve equations of the form a*sin(bx+c)=d or a*cos(bx+c)=d where a, b, c, and d are any number. For example, solve 5*sin(2x-1)=3.

Using_trigonometric_identities_to_solve_problems

Learn about different ways in which trigonometric identities, such as the Pythagorean identity and the angle addition identities, can be used to solve problems.

Introduction_to_the_trigonometric_angle_addition_identities

Learn about the trigonometric angle addition identities, which help us discuss the trig values of sums of angles in terms of the trig values of the individual angles. For example, we can express sin(x+y) in terms of sin(x), sin(y), cos(x), and cos(y).