What is 2β equal to ? [NDA I 2023]

Correct Answer is : (cos⁡α−sin⁡α)2(α - α)²(cosα−sinα)2

Correct Answer is : (cos⁡α−sin⁡α)2(α - α)²(cosα−sinα)2

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UPSC NDA I 2023 Mathematics Solved Paper

Consider the following for the next two (02) items that follow :

Let

\sin \,\beta

be the GM of

\sin \,\alpha

and

\cos \alpha ; \tan \gamma

be the AM of

\sin \,\alpha

and

\cos \alpha

[NDA I 2023]

Question : 31 of 120

Marks: +1, -0

What is

\cos 2\beta

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