UPSC NDA I 2018 Mathematics Solved Paper

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Question : 48 of 120

Marks: +1, -0

Suppose cos A is given. If only one value of cos(

A

2

) is possible, then A must be

[NDA I 2018]

An odd multiple of 90°
A multiple of 90°
An odd multiple of 180°
A multiple of 180°

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