int dfrac (2{x)^3+2x+3}({x)^2+1}dx=(x)^a+b(x)+C 则 cdot b(x)=

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

int (x)^3(e)^-(x^2)dx=(,,,,,)A、dfrac(1)(2)(e)^-(x^2)((x)^2+1)+CB、-dfrac(1)(2)(e)

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

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

8.[单选题]-|||-int dfrac (3{x)^4+3(x)^2+1}({x)^2+1}dx= () .-|||-A) ^2+arctan x+C:-|

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

int (3 cdot 2^x - 2 cdot 3^x)/(2^x) dx =A. $3x - 2\ln \frac{3}{2} \cdot \left(\f

int dfrac (2cdot {3)^x-5cdot (2)^x}({3)^x}dx-|||-__；；

(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx.

(44) int dfrac ({x)^3+1}({({x)^2+1)}^2}dx.