pyxy
幼苗
共回答了25个问题采纳率:80% 举报
x^(2/3)+y^(2/3)=a^(2/3)
2/3x^(-1/3)+2/3y^(-1/3)*y'=0
y'=-(x/y)^(1/3)
arctan(y/x)=ln(x^2+y^2)^(1/2)
1/(1+(y/x)^2) * (y'x-y)/(x^2=1/2 *1/(x^2+y^2) * (2x+2yy')
x^2/(x^2+y^2) *(y'x-y)/x^2=(x+yy')/(x^2+y^2)
(y'x-y)=x+yy'
y'(x-y)=x+y
y'=(x+y)/(x-y)
1年前
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