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x -> ∞
harus dikali sekawan dulu
jadi x-2 - √x²-1 × x-2 + √x²-1
1 x-2 + √x²-1
= x²-4x+4 - x²+1
x-2 + √x²-1
setelah itu kalika dengan 1/x², karena x² pangkat tertinggi
= 1 - 0 + 0 - 1 + 0
0 - 0 + 0
= 0