∫-∞∞ⅇⅈ⁢b⁢t⁢jn⁡(t)⁢ⅆ⁡t={π⁢ⅈn⁢Pn⁡(b),-1<b<1,12⁢π⁢(±ⅈ)n,b=±1,0,±b>1,