Math Help - Differentiate and Function problem

1. Differentiate and Function problem

Hello Friends,
I have 2 problems,
Here are they:
1) Differentiate y w.r.t. x where
y=e^(log tan x^4)^2
2) For the following function, find a point of maxima and a point of minima if these exist:
f(x)=17x^5-14x^3+44
Thanks.
harshal.

2. 1) Let v = tan(x^4) and u = log(v), then y = e^u².
Then by the chain rule: dy/dx = dy/du . du/dv . dv/dx

2) Solve: df/dx = 0, check whether its zeroes are min/max.