Problem 21.17

Show that n=0 1 (n!)2 = 1 2 2 0 e2z cos( )d. Hint: Show that zn n! 2 = 1 2i zn n!wn+1 ezwdw for n = 0, 1, 2, and is the unit circle about the origin.

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###### Chapter 21, Problem 21.17 is Solved

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