UPSC NDA I 2011 Mathematics Paper

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Question : 74 of 120

Marks: +1, -0

If z=1+cos‌

π

5

+i‌sin‌

π

5

then what is |z| equal to?

2‌cos‌
π
5
2‌sin‌
π
5
2‌cos‌
π
10
2‌sin‌
π
10

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