Find Trigonometric Values Using the Pythagorean Identity

This Find Trigonometric Values Using the Pythagorean Identity video also includes:

How and when do you use the Pythagorean Identity, sin2θ + cos2θ = 1? This question is answered for a specific problem in a short, concise video. First, the speaker reviews the definitions of all six trigonometric ratios using SOH-CAH-TOA and a few basic facts about the unit circle. Then, using an example where the sine is given, and θ is in the second quadrant, they show how to find cos θ, and the remaining four trigonometric values. 

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CCSS: Designed
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Pros

  • Common misunderstandings are reviewed at the beginning of the video
  • Clear graphics
Cons

  • None
Common Core