Khan/khan-exercises — Issue #12324: Trig identities 1 - Shouldn't the answer be 2/√2?
Author: KhanBugz
Created: 2012-01-27 22:12:33+00:00
State: open
Labels: lion, safari, wrong-or-unclear

Reporter: tennyson.mccalla@gmail.com

This is the same problem I saw last time. None of the other calculators I consulted outside of KA seem to think that the inverse of √2/2 (i.e. (radical 2) over 2 if the symbol didn't come out properly) is just 2.

Please explain this. It's frustrating and every time I come across it I keep getting set back. Am I wrong here? Is there I'm just missing? It wouldn't be the first time, but it just doesn't seem likely here.

[trig_identities_1.html?seed=57&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=57&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=57&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22None%20of%20the%20above.%5C%22%22%2C482%5D%2C%5B%22correct-activity%22%2C%22%5C%22%3Ccode%20style%3D%5C%5C%5C%22display%3A%20none%3B%20%5C%5C%5C%22%3E%5C%5C%5C%5Csqrt%202%3C%2Fcode%3E%5C%22%22%2C12%5D%5D)

["None of the above.","\\sqrt 2"]

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