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e^{x} = ?

x - \frac{x^{2}}{2} + \frac{x^{3}}{3} - \frac{x^{4}}{4} + . . . .

1 - \frac{x^{2}}{2!} + \frac{X^{4}}{4!} - \frac{X^{6}}{6!} + . . . .

x - \frac{x^{3}}{3!} - \frac{x^{4}}{4!} + . . . .

1 + x + \frac{x^{2}}{2!} + \frac{x^{3}}{3!} + . . . . . .

ANS : 4

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