In this 11 lesson unit the sine and cosine functions are extended from right triangle trigonometry by the use of the unit circle. Angles are specified in both degrees and radians throughout the unit. The transformations of the sine and cosine functions are developed and sinusoidal terminology is emphasized, including amplitude, frequency, period, and midline. Finally, the tangent, cotangent, secant, and cosecant functions are introduced.To access the lesson videos on YouTube use your smartphone