Question 1205951: Use De Moivres Theorem to simplify Power[\(40)cos\(40)Divide[\(40)5pi\(41),6]\(41)-sin\(40)Divide[\(40)5pi\(41),6]\(41)\(41),7].
I need help please, I have done some examples but keep getting stuck. Hopefully it comes across OK. Thank you Poss.
Answer by ikleyn(52752)   (Show Source):
You can put this solution on YOUR website! .
As your post appears at this forum, it is unreadable.
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Comment from student: (cos(5pi/6)-sin(5pi/6))^7 I checked and this should work. I will re-ask the questions as well. Thank you Poss
My response : as your equation/expression is written in your comment/update, it is INCORRECT.
The de Moivre theorem relates to COMPLEX numbers, while the number in your update is a REAL number.
When I see an error in a post, I can not trust to any other letter/symbol/word in such post.
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