∫﹙1→∞﹚td[e^﹙-st﹚]
=t[e^﹙-st﹚]|﹙1→∞﹚- ∫﹙1→∞﹚[e^﹙-st﹚]dt
=【0-e^﹙-s﹚】-﹙-1/s﹚ ∫﹙1→∞﹚[e^﹙-st﹚]d﹙-st﹚
=-e^﹙-s﹚+1/s×e^﹙-st﹚|﹙1→∞﹚
=-e^﹙-s﹚+1/s×[0-e^﹙-s﹚]
=-e^﹙-s﹚﹙1+1/s﹚
∫﹙1→∞﹚td[e^﹙-st﹚]
=t[e^﹙-st﹚]|﹙1→∞﹚- ∫﹙1→∞﹚[e^﹙-st﹚]dt
=【0-e^﹙-s﹚】-﹙-1/s﹚ ∫﹙1→∞﹚[e^﹙-st﹚]d﹙-st﹚
=-e^﹙-s﹚+1/s×e^﹙-st﹚|﹙1→∞﹚
=-e^﹙-s﹚+1/s×[0-e^﹙-s﹚]
=-e^﹙-s﹚﹙1+1/s﹚