Khan/khan-exercises — Issue #14112: Trig identities 1 - cos0 is not 0, its 1
Author: KhanBugz
Created: 2012-02-18 04:54:41+00:00
State: open
Labels: chrome, wrong-or-unclear

Reporter: atik.bd08@gmail.com

here solution shows cos0 is 0, but as far i can remember cos0 is 1, answer should be none of the above (sinx=0, cscx=undefined).

[trig_identities_1.html?seed=95&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=95&problem=0&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/trig_identities_1.html?seed=95&problem=0&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5C%22None%20of%20the%20above.%5C%22%22%2C30%5D%2C%5B%22hint-activity%22%2C%220%22%2C26%5D%5D)

["None of the above."]

Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7

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