If (lim)(xvec0)(a e^x+bcos x+c e^(-x))/(...

If `(lim)_(xvec0)(a e^x+bcos x+c e^(-x))/(e^(2x)-2e^x+1)=4,t h e n` a.`a=2` b. b=-4 c. `c=2` d.`` `a+b+c=-8`

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