| e x 1 | = e 2 x { e x 1 = e 2 x e x 1 0 { e x + 1 = e 2 x e x 1 < 0 { e 2 x e x + 1 = 0 e x 1 { e 2 x + e x 1 = 0 e x < 1 { x e x e 0 { e x = 1 + 5 2 e x = 1 5 2 e x < e 0 { x { e x = 5 1 2 x < 0 { x { x = ln 5 1 2 x < 0 { x { x = ln 5 1 2 x = ln 5 1 2 abs{ e^x - 1 }=e^{ 2x } newline left lbrace binom {e^x - 1 = e^2x} {e^x - 1 >= 0} right none or left lbrace binom {-e^x + 1 = e^2x} {e^x - 1 < 0} right none newline left lbrace binom {e^2x-e^x+1=0} {e^x >=1} right none or left lbrace binom {e^2x+e^x - 1 =0} {e^x < 1} right none newline left lbrace binom { notexists x in Re} {e^x >= e^0} right none or left lbrace binom {e^x={-1+sqrt 5}over {2} or e^x={-1-sqrt 5}over {2}} {e^x < e^0} right none newline left lbrace { notexists x in Re } right none or left lbrace binom {e^x={sqrt 5 - 1}over {2} } {x<0} right none newline left lbrace { notexists x in Re } right none or left lbrace binom {x=ln {sqrt 5 - 1}over {2} } {x<0} right none newline left lbrace { notexists x in Re } right none or left lbrace {x=ln {sqrt 5 - 1}over {2} } right none newline x=ln {sqrt 5 - 1}over {2}