Find the limit of the following:  a) lim x→∞ (1 - x2 / x3 - x + 1) b) lim x→∞ (x - x√x / 2x3/2 + 3x - 5) c) lim x→∞ (x2 / √x4 + 1)    *the x4 + 1 are both under the √ symbol*

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