SOLUTION: Use the addition and subtraction formula to simplify cos(x+pi)
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Question 91487: Use the addition and subtraction formula to simplify cos(x+pi)
Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!
cos(x + ) = cos(x)cos() - sin(x)sin()
cos(x)(-1) - sin(x)(0)
-cos(x)
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