Khan Academy: Trigonometry: More Trig Graphs

You and your learners will enjoy having many copies of this trigonometric graph set on the Cartesian coordinate grid with a domain running from -360 degrees to 360 degrees and a range running from -2 to 2.

Video shows solving an equation with sine and cosine by using a trigonometric identity and solving the resulting quadratic equation. [10:01]

Continuation of video lesson using the basic trigonometric functions to determine unknown side lengths of a right triangle. Example shows using trigonometry as well as the Pythagorean Theorem to find the length of the third side of the...

Video using the basic trigonometric functions to find the length of a side in a right triangle. Examples are given with angle measures in radians. Includes link to additional practice problems. [10:03]

Video demonstrates simplifying a trigonometric expression relating unknown sides and angles of a triangle by using trigonometric identities. [15:13]

Video deriving the double angle formulas for sine and cosine as well as the start of finding the cosine of the opposite of an angle. Reviews basic trigonometric ratio definitions and some basic trigonometric identities. [9:57]

Video expands upon trigonometric identities derived in previous videos. Identities in this lesson include sine and cosine of the opposite of an angle, sine of an angle plus pi divided by two, and the sine of the difference of two angles....

Demonstrates solutions to three problems. Problems address understanding of graphs of quadratic equations and translations of graphs of quadratic equations. [11:31]

Video containing the beginning of a solution to a navigation problem that uses trigonometry to find the missing length of a triangle. [9:57]

Video continues and completes the solution to a navigation problem that uses trigonometry to find the missing length of a triangle. [2:51]