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Why is tan^-1(tan 10pi/11) = -pi/11 ?

Posted 11 years ago

I thought that if the inverse was taken to its function, it would just cancel itself out and leave the value inside. Thus, tan^-1(tan 10pi/11) = 10pi/11,

But the correct answer is -pi/11. Can someone please explain to me why?

I would greatly appreciate the help. Thank you.

POSTED BY: K M
POSTED BY: Gianluca Gorni
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