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Answers
[(cosx)(x)-cosx]dx
=(x)(sinx)-(sinx)dx-sinx
=(x-1)(sinx)+cosx+constant
これは正解ですか
udv=uv-vdu
x=u dx=du
(cosx)dx=dv v=sinx
Were you able to resolve your confusion?
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部分積分なんですね！！ありがとうございます！