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(Solved): help solving  Use an Addition or Subtraction Formula to find the exact value of the expression, ...


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Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1. \[ \cos \left
Use an Addition or Subtraction Formula to find the exact value of the expression, as demonstrated in Example 1. \[ \cos \left(255^{\circ}\right) \]


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