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0 = x^2 - 2x + 1
0 = (x-1)(x-1)
x-1 = 0
x = 1
2. persamaan garis singgung pada parabola y = x^2 - 2x melalui titik (2,0)
y=x^2-2x
y=(x-2)x
->x-2=m
m=2-2=0
y-y1=m(x-x1)
y-0=m(x-2)
y=0(x-2)
y=0
*CMIIW