Khan Academy Static

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

2613_Using_trigonometric_identities.html

2612_Using_trig_angle_addition_identities_manipulating_expressions.html

2610_Finding_trig_values_using_angle_addition_identities.html

2611_Using_trig_angle_addition_identities_finding_side_lengths.html