Khan/khan-exercises — Issue #7123: Inverse trig functions - Typing "0 pi" as answer is not accepted as correct answer
Author: KhanBugz
Created: 2011-11-27 14:33:04+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

Reporter: hauke.hillebrandt@gmail.com

Hi,
this exercise states that one should give the answer in terms of radians sometimes ('Ex: 3/4 pi') and under the answer box 'a multiple of pi'. However, when one types '0 pi' instead of '0' (e.g. for tan ^-1 (0), it doesn't count as a correct answer.

Thanks!

[inverse_trig_functions.html?seed=138&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/inverse_trig_functions.html?seed=138&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/inverse_trig_functions.html?seed=138&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%222%20pi%5C%22%22%2C47%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C6%5D%2C%5B%22hint-activity%22%2C%220%22%2C7%5D%2C%5B%22hint-activity%22%2C%220%22%2C8%5D%2C%5B%22incorrect-activity%22%2C%22%5C%220%20pi%5C%22%22%2C13%5D%2C%5B%22correct-activity%22%2C%22%5C%220%5C%22%22%2C9%5D%5D)

["2 pi","0 pi","0"]

Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.2 (KHTML, like Gecko) Chrome/15.0.874.121 Safari/535.2

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