Correct answer for all n

*To*: mathgroup at smc.vnet.net*Subject*: [mg113216] Correct answer for all n*From*: Sam Takoy <sam.takoy at yahoo.com>*Date*: Tue, 19 Oct 2010 05:55:11 -0400 (EDT)

Hi, Assuming[Element[n, Integers], 1/(2 \[Pi]) Integrate[Sin[a]*Exp[-I*n*a], {a, -Pi, Pi}]] returns 0, where as for n = 1 the answer is not zero. Anyway to have Mathematica acknowledge that automatically? Many thanks in advance, Sam