0令In=e—xsinn,xdx=—e—xsinnx+n e—xcosnxdx =一e—xsinnx—ne—xcosnx—n2In。 所以

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解析 令In=e—xsinn,xdx=—e—xsinnx+n e—xcosnxdx
=一e—xsinnx—ne—xcosnx—n2In
所以
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