(7) (int )_(0)^pi (1-(sin )^3theta )dtheta ;
计算下列定积分：(int )_(0)^pi (1-(sin )^3theta )dtheta计算下列定积分：
9.计算下列积分:-|||-(1) (int )_(0)^2pi dfrac (1)(5+3sin theta )dtheta ;-|||-(2) (int
(int )_(dfrac {pi )(4)}^dfrac (pi {2)}dtheta (int )_(0)^cot theta (r)^2cos theta
( 10 ) (int )_(0)^dfrac (pi {4)}(tan )^2theta dtheta ;
(int )_(0)^dfrac (pi {2)}sqrt (1-sin 2x)dx;
(1)求 (int )_(0)^dfrac (pi {2)}sqrt (1-sin 2x)dx;
设 M=int_(-(pi)/(2))^(pi)/(2) (sin x)/(1+x^2) cos^4 x dx，N=int_(-(pi)/(2))^(pi)/(
计算定积分 int_(0)^pi sin xdx= ( )A. 1B. -1C. 2D. -2
(4)int_((pi)/(4))^(pi)/(3)(x)/(sin^2)xdx;(4)$\int_{\frac{\pi}{4}}^{\frac{\pi}{3}