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Question

limnnr=11nsinrπ2n is

A
π/2
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B
2
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C
2/π
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D
none of these
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Solution

The correct option is C 2/π
limnnr=11nsinrπ2n

=limn1nnr=1sinrπ2n

=10sinπx2dx=[2πcosπx2]10=2π

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