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# Have I made a calculation error? watch

1. I'm trying to show that by expressing them in terms of the exponential function.

I have that and

But I got that which is not what I was looking for,

2. (Original post by RamocitoMorales)
Yes, you made a calculation error. Post details if it's still not coming out, though you'll probably see it if you check through yourself.
3. (Original post by ghostwalker)
Yes, you made a calculation error. Post details if it's still not coming out, though you'll probably see it if you check through yourself.
4. (Original post by RamocitoMorales)
Not sure of the methodology, as my complex analysis is non-existent, however:

On your last step, depending on how you did it, when you multiply top and bottom by i, you get i^2=-1, or if you divided by i, then you get 1/i = -i on the bottom.
5. (Original post by ghostwalker)
Not sure of the methodology, as my complex analysis is non-existent, however:

On your last step, depending on how you did it, when you multiply top and bottom by i, you get i^2=-1, or if you divided by i, then you get 1/i = -i on the bottom.
Ah, thanks, I've got it. I made the mistake of treating as a real number.

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