SOLUTION: Use an Addition or Subtraction Formula to find the exact value of the expression.
cos 195°
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Question 873030: Use an Addition or Subtraction Formula to find the exact value of the expression.
cos 195°
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Use an Addition or Subtraction Formula to find the exact value of the expression.
cos 195°
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cos(195) = -cos(15) = -cos(30/2)
Use the half-angle formula to solve.
Cheers,
Stan H.
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