SOLUTION: Find the exact value of arctan(tan(5pi/7)) ...I don't get it! Is there a formula to use??

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Question 810806: Find the exact value of arctan(tan(5pi/7)) ...I don't get it! Is there a formula to use??
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Find the exact value of arctan(tan(5pi/7))
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5pi/7 is the angle
The tangent of it is some number.
Then, arctan is the angle whose tangent is that number.
= 5pi/7