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) About Me  (Show Source):
You can put this solution on YOUR website!
cos(x + pi) = cos(x)cos(pi) - sin(x)sin(pi)
cos(x)(-1) - sin(x)(0)
-cos(x)
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graph%28800%2C200%2C-13%2C13%2C-1%2C1%2C-cos%28x%29%29