（0.7分）int sin 4xdx=dfrac (1)(4)int sin 4xdx=dfrac (1)(4)cos 4x+cA 正确B 错误

设=(int )_(-dfrac {pi )(2)}^dfrac (pi {2)}dfrac (sin x)(1+{x)^2}(cos )^4xdx, =(in

求 int (sin )^4xdx

int 4xdx=填空题（共13题，30.0分）22.（2.3分）$\int 4xdx=$

int (tan )^4xdx; ;

A int cos xdx=sin x+CB int cos xdx=sin x+CC int cos xdx=sin x+CD int cos xdx=sin

(4) int (e)^x(sin )^2xdx.

(int )_(-1)^1dfrac (xdx)(sqrt {5-4x)}

(int )_(-1)^1dfrac (xdx)(sqrt {5-4x)}

(4)int_((pi)/(4))^(pi)/(3)(x)/(sin^2)xdx;(4)$\int_{\frac{\pi}{4}}^{\frac{\pi}{3}

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