## some1 2 years ago Derive the following.

1. some1

$(\frac{ y+1 }{ y-1 })^-17$

2. some1

That's to the power of -17

3. saifoo.khan

$(y+1)^{-17} * (y-1)^{17}$

4. some1

yeah i guess you can rephrase it that way?

5. saifoo.khan

Now i guess we'll use the product rule?

6. saifoo.khan

Dang! Why not apply the quotient rule? D:

7. some1

you would get 1/ something

8. saifoo.khan

One more mistake. $(\frac{y+1}{y-1})^{-17} \to (\frac{y-1}{y+1} )^{17}$

9. some1

yeah i had that in the beginning lol

10. saifoo.khan

Now apply the quotient rule!|dw:1358919611478:dw|

11. saifoo.khan

Lol. I didn't see it before.

12. saifoo.khan

|dw:1358919803476:dw|

13. saifoo.khan

|dw:1358920015994:dw|

14. some1

a lot of work, but thanks saif! :)

15. saifoo.khan

So do you understand it or just gonna copy down the working? Jk.

16. some1

no i actually got it haha. i was just confused as to how to start it...like there's another problem that involves chain rule and product rule, but i'm not sure which one to use first lol

17. saifoo.khan

Haha. ;) Practice makes a man pefect. ;D

18. some1

lol yes it does haha thanks again