Posted by Jess on Thursday, December 6, 2012 at 7:45pm.
f = (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)