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y' = x + 4/x²
di titik (-1, 9/2),
y' = (-1) + 4/(-1)²
y' = 3
persamaan garis singgungnya,
y - y1 = y' (x - x1)
y - 9/2 = 3(x + 1)
perpotongan garis singgung dengan sumbu Y jika,
y - 9/2 = 3(0 + 1)
y = 15/2
koordinat titik potongnya adalah (0, 15/2)