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Question

The value of limn1n2n1r=0n2n2+4r2 is

A
12tan1(2)
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B
12tan1(4)
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C
tan1(4)
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D
14tan1(4)
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Solution

The correct option is B 12tan1(4)
limn1n2n1r=011+4(rn)2
=20dx1+4x2=12tan1(2x)|20=12tan14

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