# De Moivre's Theorem - Help

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#1
I need to simplify the expression

cos(theta)-jsin(theta)/cos4(theta)-jsin4(theta)

Ive managed to simplify to:

cos5(theta)+jsin(theta)

I have been told this is wrong but i dont know where ive made the mistake. Can someone help direct me.

Thanks
0
1 month ago
#2
(Original post by Herbie0209)
I need to simplify the expression

cos(theta)-jsin(theta)/cos4(theta)-jsin4(theta)

Ive managed to simplify to:

cos5(theta)+jsin(theta)

I have been told this is wrong but i dont know where ive made the mistake. Can someone help direct me.

Thanks
Try expressing the numerator and denominator in the form e^j(something)
0
#3
(Original post by old_engineer)
Try expressing the numerator and denominator in the form e^j(something)
sorted this now, thanks
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