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(1) y+xe^y-x²=1
y'+e^y+xe^y•y'-2x=0
y'(1+xe^y)=2x-e^y
y'=(2x-e^y)/(1+xe^y)
(2) ysinx-xsiny=0
y'sinx+ycosx-siny-xcosy•y'=0
y'(sinx-xcosx)=siny-ycosx
y'=(siny-ycosx)/(sinx-xcosx)
y'+e^y+xe^y•y'-2x=0
y'(1+xe^y)=2x-e^y
y'=(2x-e^y)/(1+xe^y)
(2) ysinx-xsiny=0
y'sinx+ycosx-siny-xcosy•y'=0
y'(sinx-xcosx)=siny-ycosx
y'=(siny-ycosx)/(sinx-xcosx)
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