方程y″+py′+qy=e^ax[pl(x)cos βx+pn(x)sin βx]特解的又一简单求法
방정y″+py′+qy=e^ax[pl(x)cos βx+pn(x)sin βx]특해적우일간단구법
A Simple Method to Obtain Particular Solution of y″+py′+qy=e^ax[pl(x)cos βx+pn(x)sin βx]
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