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Question

ddxtan1(1x1+x)=

A
21+x2
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B
11+x2
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C
21+x2
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D
11+x2
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Solution

The correct option is B 11+x2
ddxtan1(1x1+x)=11+(1x1+x)2×(1+x)(1)(1x)(1)(1+x)2
=2(1+x)2+(1x)2=22(1+x2)=11+x2

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