2. 考研
  3. cosx2dx=________．

cosx2dx=________．

admin2017-10-17  21
问题 cosx2dx=________．
选项
答案[*]
解析 改变积分次序得
∫01dycosx2dx+dycosx2dx=∫01dx∫x2xcosx2dy
=∫01xcosx2dx=∫01cosx2d(x2)=sinx2|01
=sinl．
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考研数学三

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