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September 28th, 2014, 06:47 PM  #1 
Newbie Joined: May 2014 From: California Posts: 4 Thanks: 0  Confused on how following was derived
Hello everyone! I was working on some Fourier transform problems and was going over an example. I am confused on the following was derived: From: Any information would be great! Thanks! 
September 28th, 2014, 07:32 PM  #2 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,671 Thanks: 2651 Math Focus: Mainly analysis and algebra 
I presume $\mathbb j = \sqrt{1}$. Recall that $$e^{\mathbb j \theta} = \cos \theta + \mathbb j \sin \theta$$and that $\cos x$ is even and $\sin x$ is odd. 
September 29th, 2014, 11:48 AM  #3 
Newbie Joined: May 2014 From: California Posts: 4 Thanks: 0 
Thank you! That makes sense!


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