∫ (sinx)^3/(cosx+sinx) dx=1/√2*∫ (sinx)^3/(sin45*cosx+cos45*sinx) dx=1/√2*∫ (sinx)^3/sin(45+x) dx设45+x=t ∴dx/dt=1有=1/√2*∫ (sin(t-45))^3/sint dx=1/√2*∫ (sint /√2 - cost /√2 )^3/sint dx 将...