int dfrac (dx)(sqrt {1+{e)^x}}

( 单选题 ) int dfrac ({e)^x}(1+{e)^2x}dx=_________int dfrac ({e)^x}(1+{e)^2x}dx=int

int dfrac ({x)^3}(sqrt {1+{x)^2}}dx,

[题目] int dfrac (xarctan x)(sqrt {1+{x)^2}}dx

(int )_(1)^sqrt (3)dfrac (dx)({x)^2sqrt (1+{x)^2}};

(16) (int )_(1)^sqrt (3)dfrac (dx)({x)^2sqrt (1+{x)^2}};

(9) int dfrac (1)({x)^2sqrt (1+{x)^2}}dx

.int dfrac (sqrt {1+{x)^2}+sqrt (1-{x)^2}}(sqrt {1-{x)^4}}dx.

[题目]-|||-int (dfrac (3)(1+{x)^2}-dfrac (2)(sqrt {1-{x)^2}})dx

求定积分(int )_(1)^sqrt (3)dfrac (1)({x)^2sqrt (1+{x)^2}}dx求定积分

(int )_(1)^(e^2)dfrac (ln x)(sqrt {x)}dx= __