y=sin(x+y)的隐函数的二阶导数.
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解决时间 2021-03-03 21:17
- 提问者网友:嗝是迷路的屁
- 2021-03-03 12:29
y=sin(x+y)的隐函数的二阶导数.
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- 五星知识达人网友:孤独的牧羊人
- 2021-03-03 13:59
y'=[sin(x+y)]'(x+y)'=(1+y')cos(x+y)=cos(x+y)+y'cos(x+y)y'=cos(x+y)/[(1-cos(x+y)]y''=[cos(x+y]'(x+y)'+y''cos(x+y)+y'[cos(x+y)]'=-(1+y')sin(x+y)+y''cos(x+y)-y'(1+y')sin(x+y)y''[cos(x+y)-1]=(1+y')^2sin(x+y)={1+cos(x+y)/[(1-cos(x+y)]}^2sin(x+y)=sin(x+y)/[cos(x+y)-1]^2y''=sin(x+y)/[cos(x+y)-1]^3======以下答案可供参考======供参考答案1:y'=cos(x+y)*(1+y')=cos(x+y)+y'cos(x+y)∴y'=cos(x+y)/[(1-cos(x+y)]y''=-sin(x+y)*(1+y')+y''cos(x+y)+y'*(-sin(x+y)*(1+y'))∴[cos(x+y)-1]y''=sin(x+y)*(1+y')²,即y''=sin(x+y)/[cos(x+y)-1]³
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- 1楼网友:青灯有味
- 2021-03-03 14:36
对的,就是这个意思
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