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

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


   

Question 409940: Hi, please help me with this problem:
What is the exact value of cos(arccos (-1/2))
Thanks!!
Answer by richard1234(7193) 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.