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August 29, 2015
Posted by **Jess** on Thursday, December 6, 2012 at 7:45pm.

1. find the third derivative of

f(t)=(t-1)/(t+1)

2.

y= x^(x^2) ; dy/dx

please help! thank you!

- MATH urgent -
**Steve**, Thursday, December 6, 2012 at 10:33pmf = (t-1)/(t+1)

f' = 2/(t+1)^2

now it's easy

f'' = -4/(t+1)^3

f''' = 12/(t+1)^4

y = x^(x^2)

lny = x^2 ln x

1/y y' = 2x lnx + x^2/x

y' = y(2x ln x + x)

and plug back in y = x^(x^2)