Prove Cos2A=Cos^2A-Sin^2A

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This tutorial video is the proof to Cos2A=Cos^2A-Sin^2A (double angle formula). Leaving Cert Higher Level Trigonometric Functions.
  1. Tulla Maths
  2. Prove Cos2A=Cos^2A-Sin^2A
  3. prove cos2A=cos squared A minus sin squared A
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can you use cos^2 = 1/2(1+cos2A) and sin^2?

_aks