∫﹙0,2π﹚｜sinx-cosx｜dx=∫﹙0,π/4﹚(cosx-sinx)dx+∫﹙π/4,5π/4﹚(sinx-cosx)dx+∫﹙5π/4,2π﹚(cosx-sinx)dx=(sinx+cosx)｜﹙0,π/4﹚+(-cosx-sinx)｜﹙π/4,5π/4﹚+(sinx+cosx)｜﹙5π/4,2π﹚=【（√2/...