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- Mar 26th 2011, 10:00 AM #1

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## why i=e^î*(pi/2) ?

why i=e^î*(pi/2)

Guys please let us know that I am not so good in maths... and I think the question that I am asking is not so easy ... however I strongly believe that in this forum we have people who can make me understood this (although I am not so good in maths) and have abilities to understand this kind of questions! ... THANKS

- Mar 26th 2011, 10:08 AM #2

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- Mar 26th 2011, 10:12 AM #3

- Mar 26th 2011, 10:12 AM #4

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- Mar 26th 2011, 10:23 AM #5
You've done this a few times on threads to which I have contributed. (sandwiched my post with duplicates of yours)

I don't mean to be redundant- it's kinda slow typing laTex on an iPhone.

Anyhow, I can't think of a legitimate reason why you would create a^n exact duplicate post, then edit (almost delete) your previous post to ".".

It's just obnoxious in my book

Regardless, the question is answered.

- Mar 26th 2011, 10:57 AM #6

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Please, don't jump to assumptions about my intentions.

There seems to be a problem with this forum/my computer, whereby once I hit the post reply button, the post is submitted, but the screen returns to the 'Go Advanced' page, leading me to believe that the post hasn't been submitted, thus leading to me posting it again.

So, rather than being obnoxious, I am in fact the victim of some sort of error.

And not sure what you mean about the "."... the first I knew that I had made a duplicate post was when I returned after being e-mailed about your reply, and I haven't edited it or touched it since.

- Mar 27th 2011, 06:58 AM #7

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A little more detail.

Since we know how to add and multiply complex numbers, a good way to extend other functions from real numbers to complex numbers is to use their Taylor series.

The Taylor series for is

The Taylor series for is

and the Taylor series fror is

.

If you replace x with ix in the Taylor series for , you get

Because , , , , and , every odd power involves i while every even power does not. Separating real and imaginary parts,