(int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dxA (int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dx B (int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dx C (int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dxD (int )_(-1)^1(dfrac (sin x+1)(1+{x)^2}+(x)^4)dx

(int )_(-1)^1dfrac (1+sin x)(1+{x)^2}dx .

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

int dfrac (sin x)(1+{cos )^2x}dx=-|||-__

已知(x)=dfrac (xcos x)(1+{x)^4}+(x)^2-(int )_(-1)^1f(x)dx,则(x)=dfrac (xcos x)(1+{x

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

int dfrac (dx)(sqrt [3]{{(x+1))^2((x-1))^4}}

int dfrac (dx)(sqrt [3]{{(x+1))^2((x-1))^4}}

int dfrac (dx)(sqrt [3]{{(x+1))^2((x-1))^4}}

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

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