题目
(1)int dfrac ({e)^2x-1}({e)^x-1}dx=__________;(2)int dfrac ({e)^2x-1}({e)^x-1}dx=_________;(3)int dfrac ({e)^2x-1}({e)^x-1}dx=__________;(4)int dfrac ({e)^2x-1}({e)^x-1}dx=__________.
(1)
__________;
(2)
_________;
(3)
__________;
(4)
__________.
题目解答
答案
(1)
;
(2)
;
(3)
;
(4)

.