Instructional Video

Khan Academy: Trigonometry: Proof: Cos(a+b)=(cos A)(cos B) (Sin A)(sin B)

Curated by ACT

Video demonstrating the proof for the formula for the cosine of the sum of two angles. Includes link to additional practice problems. [9:22]

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CCSS: Adaptable
Concepts
trigonometric identities
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Additional Tags
cosine formula, cosine of the sum of 2 angles, cosine of the sum of two angles, trig identities, khan academy, khan academy math, addition formulas
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Classroom Considerations
  • This video is hosted on YouTube
Common Core
HSF-TF.C.9 HSF-TF.C.8