Derive the Cosine Sum and Difference Identities

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Important formulas you need in calculus and trigonometry
  1. Because Math
  2. conics section
  3. ellipse
  4. math olympiad
  5. calculus
  6. perimeter
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Wonderfull concept !
Using distance formula to prove Cosine(sum n difference of angles)!
So easy to digest n remember!
❤❤❤

rajendrashahane
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Sine is dual to cosine or dual sine -- the word co means mutual and implies duality!
Summing (integration, syntropy) is dual to differences (differentiation, entropy).
"Always two there are" -- Yoda.
Syntropy is dual to increasing entropy -- the 4th law of thermodynamics!
Duality a symmetry is being conserved -- the duality of Norther's theorem.

hyperduality