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xe^[f(y)] = e^y
d/dx{ xe^[f(y)] }= d/dx {e^y }
(1 + x.f'(y) . y' ) e^[f(y)] = y'.e^y
(1 + x.f'(y) . y' ) .[ (e^y) /x] = y'.e^y
(1 + x.f'(y) . y' ) = xy'
x[1-f'(y) ].y' = 1
y' = 1/{ x[1-f'(y) ] }
y''
=-[ 1 - f'(y) - xf''(y) ]/{ x[1-f'(y) ] }^2] .
d/dx{ xe^[f(y)] }= d/dx {e^y }
(1 + x.f'(y) . y' ) e^[f(y)] = y'.e^y
(1 + x.f'(y) . y' ) .[ (e^y) /x] = y'.e^y
(1 + x.f'(y) . y' ) = xy'
x[1-f'(y) ].y' = 1
y' = 1/{ x[1-f'(y) ] }
y''
=-[ 1 - f'(y) - xf''(y) ]/{ x[1-f'(y) ] }^2] .
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