定积分 (int )_(1)^2xdx=(x)^2+C ( ) ○正确 ○错误

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=

(15)int (x)^3(ln )^2xdx;

4.计算不定积分int xsin^2xdx4.计算不定积分$\int x\sin^{2}xdx$

(int )_(0)^+infty (x)^3(e)^-2xdx= __

(9) int xtan^2xdx;(9) $\int x\tan^{2}xdx;$

3.求下列不定积分.-|||-(15) int (tan )^10x(sec )^2xdx

定积分(int )_(0)^3(2)^xdx=( ).A.(int )_(0)^3(2)^xdx=B.(int )_(0)^3(2)^xdx=C.(in

7.计算下列定积分:-|||-(1) (int )_(0)^1x(e)^-xdx ;-|||-(2)(int )_(1)^xxln xdx;-|||-(3) (

不定积分int (({e)^x+2)}^3(e)^xdx=()A、 int (({e)^x+2)}^3(e)^xdx=()B 、int (({e)^x+2)}^

[题目]计算: (int )_(-2)^2sin 2xdx= __