注意：sinx/(1 + cosx) = 2sin(x/2)cos(x/2)/[2cos²(x/2)] = sin(x/2)/cos(x/2) = tan(x/2)∫(0~π/2) (x + sinx)/(1 + cosx) dx= ∫(0~π/2) x/(1 + cosx) dx + ∫(0~π/2) sinx/(1 + cosx) dx= ∫(0~π/2) x/...