15) int tan^10xcdotsec^2xdx;

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

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

(15)int (x)^3(ln )^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

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

(15)|cot^2xdx;

[题目]计算: (int )_(-2)^2sin 2xdx= __

(int )_(0)^+infty (x)^3(e)^-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$\int x\sin^{2}xdx$