Khan/khan-exercises — Issue #14249: Trig identities 1 - simplification confusing me
Author: KhanBugz
Created: 2012-02-20 21:48:35+00:00
State: open
Labels: chrome, hard, vista

In the problem the cos of x is simplified from 3/2*sqrt3 to sqrt3/2. Why isn't the answer 3*sqrt3/2? That's what I get when I multiply both terms by sqrt3. I'm not very good at this, so I can't figure out how to arrive at this simplification.

[trig_identities_1.html?seed=153&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=153&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=153&problem=0&debug&activity=%5B%5B%22hint-activity%22%2C%220%22%2C73%5D%5D)

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Mozilla/5.0 (Windows NT 6.0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11

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