Question: Help solving Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos(140) cos(160) - sin(140) sin(160 )

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Help solving Use an Addition or Subtraction
Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos(140) cos(160) - sin(140) sin(160 ) Find its exact value

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