UPSC NDA I 2011 Mathematics Paper

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Question : 105 of 120

Marks: +1, -0

The function f(x)=k‌sin‌x+‌

1

3

‌sin‌3‌x has maximum value at x=‌

π

3

. What is the value of k ?

3
‌
1
3
2
‌
1
2

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