Question

derivative of cos(1/x) / (1 + cosx)
(just wanna check my work)

Answer 1

((1+cosx)(-sin(1/x)(-1x^-2)-cos(1/x)-sin(x))/(1+cosx)^2

Answer 2

\[\frac{(1 + cosx)(-\sin(\frac{1}{x})(-\frac{1}{x^2}) - (\cos(\frac{1}{x})(-sinx)}{(1 + cosx)^2}\]

Answer 3

Then what ever that is simplified. If you want to check your work i suggest a site called www.wolframalpha.com.

Answer 4

wolfram is AMAZING! mathamatica is so good!

Answer 5

http://www.wolframalpha.com/input/?i=%28cos%281%2Fx%29%29%2F%281+%2B+cosx%29

Answer 6

Scroll down and you will see the derivative.