What is \cos 2 \beta equal to ? [NDA I 2023]

Correct Answer is : (cosα−sinα)2

\frac{(\cos \alpha- \sin \alpha)^2}{2}

UPSC NDA I 2023 Mathematics Solved Paper

Consider the following for the next two (02) items that follow :
Let sin‌β be the GM of sin‌α and cos‌α;tan‌γ be the AM of sin‌α and cos‌α.

[NDA I 2023]

Question : 31 of 120

Marks: +1, -0

What is cos‌2‌β equal to ?

[NDA I 2023]

Go to Question:

Prev Question

Next Question