Khan/khan-exercises — Issue #5839: Chain rule 1 - two correct answers!
Author: KhanBugz
Created: 2011-11-09 03:14:47+00:00
State: open
Labels: firefox, win7

Reporter: pjcwilliamson@gmail.com

Question:
f(x)=cos(x^5)
Find f'(x)

Two answers are:
(-sin(x^5))(5x^4)
(sin(x^5))(-5x^4)

Both answers are correct yet the second one was 'wrong'. I recognize that the first one follows from the process better, but correct answers are correct answers!

[chain_rule_1.html?seed=173&problem=0](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/chain_rule_1.html?seed=173&problem=0&debug)

["(\\sin{(x^{5})})(-5x^{4})","(\\sin{(x^{5})})(-5x^{4})","(\\sin{(x^{5})})(-5x^{4})","(-\\sin{(x^{5})})(5x^{4})"]

Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

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