Here's the question you clicked on:
ta123
need on the attachment
for that, I would use the quotient rule
I did, but I not getting the right answer
http://www.wolframalpha.com/input/?i=derive+%28x%5E2-2%29%2F%28sqrt%28x%5E2-1%29%29
my answer is (2x)-squrt(x^2-1)- x^3-2x/squrt(x^(2)-1)/(x^2-1)
oops I meant multiplication instead of minus after the 2x
I really don't like wolframealpha when it comes to solving problem because even though it show all the work, it look so complex as suppose an actually person showing me how to work a problem