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X^2-1 =(x+1)(x-1)
Jadi x=1 dan x=-1
Ketika x=1 subtitusi Fungsi(x) dan sisanya=
-A+1+B-1=-1+B
-A=-1
A=1
Nilai x=-1 d subtitusi
A+1-B-1=1+B
A=1+2B
1=1+2B
B=0