SOLUTION: Hi, please help me with this problem: What is the exact value of cos(arccos (-1/2)) Thanks!!

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Question 409940: Hi, please help me with this problem:
What is the exact value of cos(arccos (-1/2))
Thanks!!
Answer by richard1234(5390) About Me  (Show Source):
You can put this solution on YOUR website!
Cosine and arccosine are inverse functions, so cos%28arccos%28-1%2F2%29%29+=+-1%2F2.