If e^2x-2ye^x-1=0 then y'' equals
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e^2x-1=2ye^x
e^2x*2-0=2(e^xy'+ye^x)
y'=e^x-y
y'=e^x-(e^2x-1)/2e^x
y'=(e^2x+1)/2e^x
y''=2e^2x(2e^2x+0)+(e^2x+1)(2*2e^2x)
y''=4e^4x+4e^4x+4e^2x
y''=4e^2x(2e^2x+1)
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