lim (h->0) ((x+h)² - x²)/h = lim(h->0) (x²+2xh+h²-x²)/h = lim(x->0)(2xh+h²)/h = 2x + 0 = 2x
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lim (h->0) ((x+h)² - x²)/h = lim(h->0) (x²+2xh+h²-x²)/h = lim(x->0)(2xh+h²)/h = 2x + 0 = 2x