∫(上限π 下限0) f(x) dx (分布积分法)
=xf(x)|(上限π 下限0)-∫(上限π 下限0) x f'(x) dx
=0-∫(上限π 下限0) x* sinx/x dx (可知f(pai)=∫(上限pai 下限pain) sint/t dt =0)
=cos x|(上限π 下限0)=-2
设f(x)=∫(上限x 下限pain) sint/t dt , 计算 ∫(上限π 下限0) f(x) dx
设f(x)=∫(上限x 下限pain) sint/t dt , 计算 ∫(上限π 下限0) f(x) dx
数学人气:467 ℃时间:2019-11-23 14:19:07
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