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UP TGT Mathematics Complex Numbers Test Series - Part 2

Using De Moivre's theorem, find the real part of (cos25°+isin25°)^2.

Type: MCQ • Marks: 1
Using De Moivre's theorem, find the real part of (cos25°+isin25°)^2.
Options
A. 1.2856
B. 0.9642
C. 0.6428
D. 0.3214
Explanation
(cos25°+isin25°)^2=cos(50°)+isin(50°); real part=0.6428.
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