(9) int xtan^2xdx;

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

[题目]计算: (int )_(-2)^2sin 2xdx= __

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

15) int tan^10xcdotsec^2xdx;15) $\int \tan^{10}x\cdot\sec^{2}xdx;$

(5) int (tan )^10xcdot (sec )^2xdx;

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=

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

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

(15)|cot^2xdx;

(int )_(0)^dfrac (pi {4)}(tan )^2xdx=1-dfrac (pi )(4) __-|||-__下列式子或叙述不正确的是A.B.设