Unit Circles

Unit Circle: Defining the trigonometric functions sine and cosine for all real numbers


  1.  \rhd Unit circle definition of trig functions (9:03)How to extend SOH-CAH-TOA to define trigonometric functions (sine, cosine, and tangent) for all real numbers.
  2.   \rhd  The trig functions and right angle trig ratios (6:57)
    Pause the video and work it out on your own!Sal shows how, for acute angles, the two different definitions of the trigonometric values (SOH-CAH-TOA and the unit circle definition) result in the same values.