Arrggh...simple problem, why can't I get it?

[RESmonkey]

The answer is really B, but I put D and got it wrong.

http://img169.imageshack.us/im.../2136/problem34ks3.jpg

How the heck does one get B for an answer?

 

[DrPizza]

chain rule.

The derivative of f(g(x)) = f'(g(x)) * g'(x)

 

[yankeesfan]

chain rule

edit: beaten to it.

 

[ManBearPig]

noob...chain rule ftw

 

[MyThirdEye]

because you touch yourself at night.

 

[RESmonkey]

ohhhhhhhhhhhh. o wow.

thanks guys