Homework Help: calculus

Posted by please help! on Sunday, June 24, 2012 at 7:54pm.

Can someone help me understand how to find the derivative of these two problems:

(t^2-1/t^2+2)^3=y and y=sin^32x?

I think with the first one, I could just foil it maybe and cancel but I don't know what to do with the ^3...and then the second one I haven't gotten the hang of how to eliminate those kinds of problems yet...:(

calculus - bobpursley, Sunday, June 24, 2012 at 8:04pm
1)

y'=d/dt (uv^-1) where u= t^2-1 du=2dt
and v=(t^2+2)^3 dv= 3(t^2+2)^2 * (2t)=6t(t^2+2)^2

y'= v^-1 du -uv^-2 dv

y'=du/v -udv/v^2
then put in u,v du, dv and you have it.
calculus - please help!, Sunday, June 24, 2012 at 9:43pm
I guess it's the format but I am little confused about what you did....
calculus - Steve, Monday, June 25, 2012 at 10:40am
1)
use the quotient rule:
y = u/v
where u = t^2-1 and v = t^2+2

y' = (u'v - uv')/v^2
= [(2t)(t^2+2) - (t^2-1)(2t)]/(t^2+2)^2
= (2t^3+4t-2t^3+2t)/(t^2+2)^2
= 6t/(t^2+2)^2

2) use the chain rule:
y = u^3 where u = sin2x
y' = 3u^2 u'
= 3sin^2(2x) 2cos2x
= 6sin^2(2x) cos(2x)
or
3sin4x sin2x

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