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y'=4x³-2
untuk x=1 maka m=4(1)³-2=2 dan y=1⁴-2(1)=-1 ===> (1,-1)
mencari persamaan garis singgung dengan rumus berikut
y-y₁=m(x-x₁)
y+1=2(x-1)
y=2x-2-1
y=2x-3