Question

y=cos([1-e^2x]/[1+e^2x])

Answer 1

What are you asked to do?

Answer 2

so what's your question?

Answer 3

Differentiate......

Answer 4

let the thing inside cos be f(x) than y'=-f'(x)*sin(f(x))
Can you diff. f(x)?

Answer 5

( -2e^e)/ ( 2e^x )........

Answer 6

I got -sin (-e^x +e^3x)/(1+e^2x) ( 2e^x) for an answer..... I think its wrong....

Answer 7

no "3x" anywhere!

Answer 8

f'(x)=((-2*(1+e^2x)*e^2x)-2(1-e^2x)*e^2x)/(1+e^2x)^2

Answer 9

So, it would be e^2x....