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UPSC NDA I 2016 Mathematics Solved Paper

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For the next two (2) items that follow :
Given that
an=∫0π

sin2{(n+1)x}

sin2x

dx

[NDA I 2016]

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Question : 24

Total: 120

What is an−1−an−4 equal to ?

−1
0
1
2

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