# De Moivre's Theorem - Help

Watch
Announcements
Thread starter 1 month ago
#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
Thread starter 1 month ago
#3
(Original post by old_engineer)
Try expressing the numerator and denominator in the form e^j(something)
sorted this now, thanks
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Do you have the space and resources you need to succeed in home learning?

Yes I have everything I need (425)
56.52%
I don't have everything I need (327)
43.48%