proof of Cos(A+B)=CosA.CosB-SinA.SinB and Sin(A±B)=SinA.CosB±CosA.SinB

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Cos(A+B)=CosA.CosB-SinA.SinB and Sin(A±B)=SinA.CosB±CosA.Sin using polar coordinate concept.
  1. Easy Mathematics
  2. trigonometric ratio for compound angle
  3. polar coordinate
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