UPSC NDA I 2023 Mathematics Solved Paper

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Consider the following for the next two (02) items that follow :
Let f(x)=sin‌[π2]x+cos[−π2]‌x where [.] is a greatest integer function
[NDA I 2023]
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Question : 80 of 120
 
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What is f(‌
Ï€
4
)
equal to?
[NDA I 2023]
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