HORI E(x)
   
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"E(x)=[2-8/(x+2)] : (x²-4x+4)/(x²-4)=
=(2x+4-8)/(x+2) : (x-2)²/(x-2)(x+2)=
=(2x-4)/(x+2) : (x-2)/(x+2)=
=2(x-2)/(x+2) × (x+2)/(x-2)=
=2"