SOLUTION: Hello! How do you solve this? Evaluate the expression without using a calculator. arccos 0 Thank you

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Question 978117: Hello!
How do you solve this?
Evaluate the expression without using a calculator.
arccos 0
Thank you
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Where is the cosine= 0?
At pi/2 and 3 pi/2.