if n is an integer x is real, then show that :

I played around a bit with de moivre's theorem and other things...(Headbang)

thanks in advance.

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- Jul 28th 2013, 08:23 AMearthboytrig and complex numbers
if n is an integer x is real, then show that :

I played around a bit with de moivre's theorem and other things...(Headbang)

thanks in advance. - Jul 28th 2013, 08:58 AMChessTalRe: trig and complex numbers
- Jul 29th 2013, 04:05 AMearthboyRe: trig and complex numbers
- Jul 29th 2013, 06:41 AMBobPRe: trig and complex numbers
Start by using the identities

and so as to get everything inside the brackets in terms of half angles

Next, remove as a common factor from each of the brackets.

Then, write the two complex numbers in exponential form and finally use the exponential form for - Aug 13th 2013, 09:48 PMibduttRe: trig and complex numbers