Question 3 : By using Dc-Moivreis
theorem (cos theta +sin theta/sin theta
+i cos theta)pow4==----
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Step-by-step explanation:
De Moivre's theorem
(cosθ+isinθ)=cosnθ if n is an integer and cosnθ+isinnθ is one of the values of (cosθ+isinθ)
n
, if n is a fraction.
Corollary : The q values of ((cosθ+isinθ)
q
1
are obtained from
cos
q
2nπ+θ
+isin
q
2nπ+θ
by putting n = 0, 1, 2, ..., (q - 1).
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