Posted by Jess on .
Hello!!
1. find the third derivative of
f(t)=(t1)/(t+1)
2.
y= x^(x^2) ; dy/dx
please help! thank you!

MATH urgent 
Steve,
f = (t1)/(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)