求:由方程所确定的隐函数的导数dy/dx? y=cos(x+y)

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求:由方程y=cos(x+y)所确定的隐函数的导数dy/dx?
解:F(x,y)=y-cos(x+y)≡0;故dy/dx=-(∂F/∂x)/(∂F/∂y)=-sin(x+y)/[1+sin(x+y)]
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第1个回答  2012-06-05
y = cos(x + y)
dy/dx = dcos(x + y)/d(x + y) · d(x + y)/dx,链式法则
dy/dx = - sin(x + y) · (1 + dy/dx)
dy/dx = - sin(x + y) - sin(x + y) · dy/dx
dy/dx · [1 + sin(x + y)] = - sin(x + y)
dy/dx = - sin(x + y)/[1 + sin(x + y)
dy/dx = - 1/[1 + csc(x + y)]本回答被提问者和网友采纳

求:由方程所确定的隐函数的导数dy\/dx? y=cos(x+y)
求:由方程y=cos(x+y)所确定的隐函数的导数dy\/dx?解:F(x,y)=y-cos(x+y)≡0;故dy\/dx=-(∂F\/∂x)\/(∂F\/∂y)=-sin(x+y)\/[1+sin(x+y)]

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