Khan/khan-exercises — Issue #13696: Trigonometry challenge - tan^(-1)(sqrt(3)/3)
Author: KhanBugz
Created: 2012-02-12 23:01:00+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

Reporter: tom@ziebro.info

Problem claims that the answer is 30 degrees, which is mathematically untrue.

[trigonometry_challenge.html?seed=166&problem=7 (inverse_trig_functions)](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trigonometry_challenge.html?seed=166&problem=7&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trigonometry_challenge.html?seed=166&problem=7&debug&activity=%5B%5B%22hint-activity%22%2C%220%22%2C43%5D%2C%5B%22hint-activity%22%2C%220%22%2C47%5D%2C%5B%22hint-activity%22%2C%220%22%2C51%5D%2C%5B%22hint-activity%22%2C%220%22%2C53%5D%2C%5B%22hint-activity%22%2C%220%22%2C54%5D%5D)

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Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7

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