已知方程y=tan(y-x)确定了y=y(x) 求dy

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已知方程y=tan(y-x)确定了y=y(x)求dy已知方程y=tan(y-x)确定了y=y(x)求dy已知方程y=tan(y-x)确定了y=y(x)求dyy=tan(y-x)y''=[sec(y-x)

已知方程y=tan(y-x)确定了y=y(x) 求dy
已知方程y=tan(y-x)确定了y=y(x) 求dy

已知方程y=tan(y-x)确定了y=y(x) 求dy
y=tan(y-x)
y'=[sec(y-x)]^2*(y'-1)
=[sec(y-x)]^2*y'-[sec(y-x)]^2
y'=[sec(y-x)]^2/ {[sec(y-x)]^2-1}
=1/[1-(cos(y-x))^2]
=[csc(y-x)]^2
dy=[csc(y-x)]^2dx

dy=1/cos^2(y-x)*(dy-dx)
dx=(1-cos^2(y-x))dy
dy=dx/sin^2(y-x)

y'=sec^2(y-x)*(y'-1)
解出来y'就可以了
y'=sec^2(y-x)/tan^2(y-x)
=csc^2(y-x)
dy=csc^2(y-x)dx