Khan/khan-exercises — Issue #14137: Trig identities 1 - Incorrect Answer
Author: KhanBugz
Created: 2012-02-18 18:46:20+00:00
State: open
Labels: firefox, snowleo, wrong-or-unclear

Reporter: brunswick.kevin@gmail.com

The solution of this problem does is incorrect. The 2nd to last line shows that we need to subtract, but the operation is not executed.

[trig_identities_1.html?seed=24&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=24&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=24&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22None%20of%20the%20above.%5C%22%22%2C189%5D%2C%5B%22hint-activity%22%2C%220%22%2C4%5D%5D)

["None of the above."]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:6.0.2) Gecko/20100101 Firefox/6.0.2

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