设y=y(χ)由确定,则=_______.

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问题 设y=y(χ)由确定,则=_______.

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答案[*]

解析 当t=0时,χ=1.
    y=∫01ln(1+u)du=uln(1+u)|01-∫01du=2ln2-1
    eχsint-χ1=0两边对t求导,得eχsin.+eχcost-=0,于是=e;
    y=∫0t+1ln(1+u)du两边对t求导,得=ln(t+2),于是=ln2.
    故
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