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12. The expression e x can be written as e x = n = 0 n ! x n Where n ! = n (
12. The expression excan be written as ex=n=0n!xn
Where n!=n(n1)(n2)...(2)(1). Show thatdxdex=ex
Note: write out the first few terms of the summation. Recall that 0!=1.
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