int dfrac ({x)^3}({(1+{x)^2)}^2}dx=A.int dfrac ({x)^3}({(1+{x)^2)}^2}dx=B.int df
int dfrac (1)({x)^2}sin dfrac (3)(x)dx= __
(12) int dfrac (x)(sqrt {2)-3(x)^2}dx;
int dfrac (x)(sqrt {2-3{x)^2}}dx
int dfrac (x)(sqrt {2-3{x)^2}}dx
int dfrac (x)(sqrt {2-3{x)^2}}dx。。
(3) int dfrac (x)(sqrt {2-3{x)^2}}dx;
int dfrac (2x+3)({x)^2+3x-10}dx
int dfrac (2x+3)({x)^2+3x-10}dx;;
int dfrac ({x)^3}(9+{x)^2}dx