∫(e^x)sin(x/2) dx=∫sin(x/2) d(e^x)=(e^x)sin(x/2) - (1/2)∫(e^x)cos(x/2) dx=(e^x)sin(x/2) - (1/2)∫cos(x/2) d(e^x)=(e^x)sin(x/2) - (1/2)(e^x)cos(x/2) - (1/4)∫(e^x)sin(x/2) dx将 -(1/4)∫(e^x)sin(x/2)...