int_(0)^( pi)(x*sin x)/(1+sin x)dx=

int_(0)^( pi/2)(sin x)/(1+cos x)dx

int_(0)^( pi)(sin x)/(1+cos^(2)x)dx =

" 2."int_(0)^( pi)(x)/(1+sin x)dx

int_(0)^(pi)(cos x)/(1-sin^(m)x)dx

int_(0)^( pi)(dx)/(1+sin x)

If int_(0)^((pi)/(2))(dx)/(1+sin x+cos x)=In2, then the value of int_(0)^((pi)/(2))(sin x)/(1+sin x+cos x)dx is equal to: