设y=y(x)是由方程x2+y=tan(x-y)确定的函数,且满足y(0)=0.则y’’(0)=_________.

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问题 设y=y(x)是由方程x2+y=tan(x-y)确定的函数,且满足y(0)=0.则y’’(0)=_________.

选项

答案一1

解析 2x+y=sex2(x—y).(1-y),以x=0,y=0代入,得y(0)=1-y(0),所以再求,2+y’’=2sec(x-y)sec(x-y)tan(x一y).(1一y)2+scc2(x一y).(y’’)以x=0,y=0代入,2+y’’(0)=一y’’(0),所以y’’(0)=一1.
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