求长函数的导数

y == \[Beta]*exp[1 - x] + (\[Alpha] - \[Beta]e)*
exp[-x -
x/\[Epsilon]] + \[Epsilon]*[\[Beta]*(1 - x)*exp[1 - x] - \[Beta]*
exp[1 - x - x/\[Epsilon]]]
u == D[y, {x, 2}]
v == D[y, x]
t == \[Epsilon]*u + (1 + \[Epsilon]^2)*v + (1 - \[Epsilon]^2)*y
t ==

==是等价判定

Exp大写，运算优先级一律用小括号表示