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