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y' = 2x
y' = 2(2)
y' = 4
y - 4 = 4(x - 2)
y - 4 = 4x - 8
y = 4x - 4
y =4(x-1) ← Ecuación de la recta tangente
L(x) = f'(2)(x-2) + f(2)
Finalmente
y = 2(2)(x-2) + 2^2
y = 4(x-2) + 4
O en su forma estándar
y = 4x - 4