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Granice funkcji:
lim(x-->-∞) 2^x + 4 / 2^x + 1 = 4 bo w -∞ 2^x --->0
lim(x-->+∞) 2^x + 4 / 2^x + 1 = 1 + 4/2^x / 1 + 1/2^x = 1, bo w +∞ 1/2^x ---> 0
A zatem (1, 4) jest zbiorem wartości