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# complex numbers watch

1. I feel like I'm missing something with this question on complex numbers

Work out
e^-pi/2

So far I've done
Cos(pi/2) - isin(pi/2)
Is this correct?
2. (Original post by RHCPfan)
I feel like I'm missing something with this question on complex numbers

Work out
e^-pi/2

So far I've done
Cos(pi/2) - isin(pi/2)
Is this correct?
Assuming you meant then yeah you're on the right lines, though it's not really needed if you sketch it on an Argand diagram.
3. (Original post by RDKGames)
Assuming you meant then yeah you're on the right lines, though it's not really needed if you sketch it on an Argand diagram.
Sorry, yes that is what I meant thanks.

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