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(x + h)² - x²
Lim ------------------ Desarrollas el producto notable
h->0 h (a - b)² = a² + 2ab + b²
x² + 2xh + h² - x²
Lim -------------------------- Simplificas x²
h->0 h
2xh + h²
Lim -------------- Factorizas sacas factor común h
h->0 h
h(2x + h)
Lim --------------- Simplificas h
h->0 h
Lim 2x + h =
h->0
2x + 0 =
2x
Respuesta.
2x