Khan/khan-exercises — Issue #4411: Trig identities 1 - Overly complicated explanation
Author: KhanBugz
Created: 2011-10-16 01:17:25+00:00
State: open
Labels: chrome, win7

Reporter: toffa@ymail.com

If cscx = 1, then tanx = ?

Your explanation is too complicated.
Here's my explanation:
cscx = 1/sinx so sinx = 1
Using the unit circle diagram (or your own knowledge) when sinx = 1 cosx = 0
tanx = sinx/cosx = 1/0 = undefined

Your explanation uses a lot more identities and the weird concept of (undefined)^2

[trig_identities_1.html?seed=59&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=59&problem=0&debug)

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Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1

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