SOLUTION: sec^-1 (-1)

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Question 751521: sec^-1 (-1)
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
sec^-1 (-1)
let x=angle whose sec=(-1)
sec(x)=-1
cos(x)=1/sec(x)=1/-1=-1
x=π