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Jan 21st, 2019
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  1. cos(`ωt`) * ( cos(`ωt` - `θ`) )
  2.  
  3. cos(a - b) = cos(a) * cos(b) + sin(a) * sin(b)
  4.  
  5. a = `ωt` and b = `θ`,
  6.  
  7. cos(`ωt` - `θ`) = cos(`ωt`) * cos(`θ`) + sin(`ωt`) * sin(`θ`)
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