SOLUTION: Exact value of cos^-1(tan(3pie/4))

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Question 521601: Exact value of cos^-1(tan(3pie/4))
Answer by lwsshak3(11628) About Me  (Show Source):
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Exact value of cos^-1(tan(3pie/4))
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tan(3pie/4)=-1 (reference angle in quadrant II where tan<0)
cos^-1(-1)=π