The infinite series 1 + x + $\frac{x^2}{2!} + \frac{x^3}{3!} + \frac{x^4}{4!} + ......$corresponds to
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The infinite series 1 + x + $\frac{x^2}{2!} + \frac{x^3}{3!} + \frac{x^4}{4!} + ......$corresponds to