Khan/khan-exercises — Issue #4484: Inverse trig functions - Inverse trig functions
Author: KhanBugz
Created: 2011-10-17 17:57:31+00:00
State: open
Labels: ie8, xp

What is the principal value of arctan(−1) \arctan\left(-1\right)?

answer could be 3/4 pi

[inverse_trig_functions.html?seed=158&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/inverse_trig_functions.html?seed=158&problem=0&debug)

["3/4 pi","3/4 pi","-1/4 pi"]

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