Khan/khan-exercises — Issue #11038: Trig identities 1 - Perhaps wrong answer
Author: KhanBugz
Created: 2012-01-12 15:29:21+00:00
State: open
Labels: chrome, win7, wrong-or-unclear

Reporter: 68wstokes@gmail.com

Either the answer to this question is wrong, or the steps you include to answer this question are not clear enough for me to get the answer provided. It says that secx should be equal to the square root of two. The second and third steps are the same thing written in different ways, because square root 2 = 1/cosx as seen in step two is the same thing as writing square root 2 = secx. If the secx is 1/cosx and the cosx is square root 2/2, shouldn't you be able to divide 1 by square root 2/2 and get 2 over square root 2?

[trig_identities_1.html?seed=125&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=125&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=125&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22None%20of%20the%20above.%5C%22%22%2C130%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%5D)

["None of the above."]

Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

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