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

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

int dfrac ({x)^3}(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

[题目] int dfrac (x)(sqrt {1-{x)^2}}dx

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

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

int dfrac ({x)^3}({(1+{x)^2)}^2}dx=A.int dfrac ({x)^3}({(1+{x)^2)}^2}dx=B.int df

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