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=√1 + (x per x-1)²
=√1 + x² per x²-2x+1
=√x²-2x+1+x² per x²-2x+1
=√2x²-2x+1 per x²-2x+1
(gof)(-1)
=√2.(-1)² - 2.(-1) + 1 per (-1)² - 2.(-1) + 1
=√2+2+1 per 1+2+1
=√5 per 4
bentuk lebih sederhana dari √5per4:
1/2√5
keterangan: yang pake kata 'per' itu maksudnya pecahan ya.