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Mathematics 7 Online
OpenStudy (anonymous):

What is the exact value of: tan^-1(tan(4pi/5)) I put 4pi/5 as the answer, why is that wrong?

OpenStudy (bahrom7893):

should be correct. maybe u made a typo

OpenStudy (whpalmer4):

Perhaps they are looking for the principal value...

jimthompson5910 (jim_thompson5910):

It has to do with the fact that the range of the arctan function is -pi/2 <= y <= pi/2

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