15.计算定积分I=int_(1)^3|x-2|dx.15.计算定积分$I=\int_{1}^{3}|x-2|dx$.
计算定积分：int_(0)^dfrac(pi {2)}(|sin x-cos x|{d)x}．计算定积分：$\int_{0}^{\dfrac{\pi }{2}}
14、计算定积分int_(1)^e(ln^2x)/(x)dx.14、计算定积分$\int_{1}^{e}\frac{\ln^{2}x}{x}dx$.
计算定积分 int_(0)^pi sin xdx= ( )A. 1B. -1C. 2D. -2
17.计算定积分int_(0)^sqrt(2)(x^2)/(sqrt(4-x^2)) dx.17.计算定积分$\int_{0}^{\sqrt{2}}\frac{
2.计算定积分int_(0)^1ln(1+sqrt(x))dx.2.计算定积分$\int_{0}^{1}\ln(1+\sqrt{x})dx$.
int (cos x-sin x),(rm dx)=( )A. -sinx+cosx+CB. sinx-cosx+CC. -sinx-cosx+CD. si
5.求不定积分 int dfrac ({sin )^2x}(1+{sin )^2x}dx.
(int )_(0)^2pi |sin x|dx.
求下列不定积分：int dfrac (sin xcos x)(1+{sin )^4x}dx.求下列不定积分：.