3.判断题int_(1)^2 xsin xdx=int_(1)^2 tsin tdt

(d)/(dx)int_(1)^x^(2)sin tdt= （ ）A. 2xsin x²B. sint²C. sin x²D. 2tsint²

24.[填空题]int_(-1)^1x^2sin xdx=____24.[填空题]$\int_{-1}^{1}x^{2}\sin xdx=$____

2.[判断题] 判断：int_(0)^1x^m(1-x)^ndx=int_(0)^1x^n(1-x)^mdx,(m,nin N).（）A. 对B. 错

8.[判断题]•标准正态分布Phi(x)=int_(-infty)^xvarphi(t)dt=(1)/(sqrt(2pi))int_(-infty)^xe^-(

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

5【判断题】 判断:反常积分int_(0)^(1)/(2)(1)/(sqrt(x(1-x)))dx是发散的.（）A. 对B. 错

int t(e)^-2tdt.-|||-.int (ln )^2xdx-|||-.int xsin xcos xdx.-|||-15. int (x)^2(co

(15)int_(-(pi)/(2))^(pi)/(2)sqrt(cos x-cos^3)xdx;(15)$\int_{-\frac{\pi}{2}}^{\fr

int_(0)^2(1)/(1+sqrt[3](x))dx;$\int_{0}^{2}\frac{1}{1+\sqrt[3]{x}}dx;$

定积分int_(0)^(pi)/(4)sec^2xdx=11.（填空题，5.0分）定积分$\int_{0}^{\frac{\pi}{4}}sec^{2}xdx=