[*]交换积分次序得 ∫0tdx∫xtsin(xy)2dy=∫0tdy∫0ysin(xy)2dx.

admin2020-01-15  49

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解析 交换积分次序得
0tdx∫xtsin(xy)2dy=∫0tdy∫0ysin(xy)2dx.
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